add lightbox to reveal.js state, enables syncing with speaker view #3771

codespell: add config + workflow and make it fix some typos it finds

.codespellrc

@@ -0,0 +1,8 @@
+[codespell]
+# Ref: https://github.com/codespell-project/codespell#using-a-config-file
+skip = .git*,package-lock.json,*.css,.codespellrc
+check-hidden = true
+# Ignore super long lines -- must be minimized etc, acronyms
+# and some near hit variables
+ignore-regex = ^.{120,}|\b(currentY|FOM)\b
+# ignore-words-list =

.github/CONTRIBUTING.md

@@ -1,10 +1,9 @@
 ## Contributing
-
-Please keep the [issue tracker](http://github.com/hakimel/reveal.js/issues) limited to **bug reports**, **feature requests** and **pull requests**.
+Please keep the [issue tracker](https://github.com/hakimel/reveal.js/issues) limited to **bug reports**.
 
 
-### Personal Support
-If you have personal support or setup questions the best place to ask those are [StackOverflow](http://stackoverflow.com/questions/tagged/reveal.js).
+### General Questions and Support
+If you have questions about how to use reveal.js the best place to ask is in the [Discussions](https://github.com/hakimel/reveal.js/discussions). Anything that isn't a bug report should be posted as a dicussion instead.
 
 
 ### Bug Reports
@@ -12,11 +11,10 @@ When reporting a bug make sure to include information about which browser and op
 
 
 ### Pull Requests
+- Should be submitted from a feature/topic branch (not your master)
 - Should follow the coding style of the file you work in, most importantly:
   - Tabs to indent
   - Single-quoted strings
-- Should be made towards the **dev branch**
-- Should be submitted from a feature/topic branch (not your master)
 
 
 ### Plugins

.github/workflows/js.yml

@@ -1,24 +0,0 @@
-name: tests
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version: [10.x, 13.x]
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - run: npm install
-    - run: npm run build --if-present
-    - run: npm test
-      env:
-        CI: true

.github/workflows/spellcheck.yml

@@ -0,0 +1,23 @@
+# Codespell configuration is within .codespellrc
+---
+name: Spellcheck
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v2

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+name: Tests
+
+on:
+  - push
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version:
+          - 18
+          - 20
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - run: npm install
+      - run: npm run build --if-present
+      - run: npm test
+        env:
+          CI: true

.gitignore

@@ -8,5 +8,4 @@ out/
 log/*.log
 tmp/**
 node_modules/
-.sass-cache
-dist/*.map
+.sass-cache

.npmignore

@@ -1,7 +1,5 @@
 /test
 /examples
-/css
-/js
 .github
-.gulpfile
-.sass-cache
+.sass-cache
+gulpfile.js

LICENSE

@@ -1,4 +1,4 @@
-Copyright (C) 2020 Hakim El Hattab, http://hakim.se, and reveal.js contributors
+Copyright (C) 2011-2024 Hakim El Hattab, http://hakim.se, and reveal.js contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,23 +1,30 @@
 <p align="center">
-  <img src="https://hakim-static.s3.amazonaws.com/reveal-js/logo/v1/reveal-black-text.svg" alt="reveal.js" width="450">
+  <a href="https://revealjs.com">
+  <img src="https://hakim-static.s3.amazonaws.com/reveal-js/logo/v1/reveal-black-text-sticker.png" alt="reveal.js" width="500">
+  </a>
   <br><br>
-  <img src="https://github.com/hakimel/reveal.js/workflows/tests/badge.svg">
-  <img src="https://s3.amazonaws.com/static.slid.es/images/slides-github-banner-320x40.png?1" alt="Slides" width="160" height="20"></a>
+  <a href="https://github.com/hakimel/reveal.js/actions"><img src="https://github.com/hakimel/reveal.js/workflows/tests/badge.svg"></a>
+  <a href="https://slides.com/"><img src="https://s3.amazonaws.com/static.slid.es/images/slides-github-banner-320x40.png?1" alt="Slides" width="160" height="20"></a>
 </p>
 
-reveal.js is an open source HTML presentation framework. It enables anyone with a web browser to create fully featured and beautiful presentations for free. [Check out the live demo](https://revealjs.com/).
+reveal.js is an open source HTML presentation framework. It enables anyone with a web browser to create beautiful presentations for free. Check out the live demo at [revealjs.com](https://revealjs.com/).
 
-The framework comes with a broad range of features including [nested slides](https://revealjs.netlify.app/vertical-slides/), [Markdown support](https://revealjs.netlify.app/markdown/), [Auto-Animate](https://revealjs.netlify.app/auto-animate/), [PDF export](https://revealjs.netlify.app/pdf-export/), [speaker notes](https://revealjs.netlify.app/speaker-view/), [LaTeX support](https://revealjs.netlify.app/math/), [syntax highlighted code](https://revealjs.netlify.app/code/) and much more.
+The framework comes with a powerful feature set including [nested slides](https://revealjs.com/vertical-slides/), [Markdown support](https://revealjs.com/markdown/), [Auto-Animate](https://revealjs.com/auto-animate/), [PDF export](https://revealjs.com/pdf-export/), [speaker notes](https://revealjs.com/speaker-view/), [LaTeX typesetting](https://revealjs.com/math/), [syntax highlighted code](https://revealjs.com/code/) and an [extensive API](https://revealjs.com/api/).
 
-<h1>
-  <a href="https://revealjs.netlify.app/installation" style="font-size: 3em;">Get Started</a>
-</h1>
+---
 
-## Documentation
-The full reveal.js documentation is available at [revealjs.com](https://revealjs.netlify.app).
+Want to create reveal.js presentation in a graphical editor? Try <https://slides.com>. It's made by the same people behind reveal.js.
 
-## License
+---
 
-MIT licensed
+### Getting started
+- 🚀 [Install reveal.js](https://revealjs.com/installation)
+- 👀 [View the demo presentation](https://revealjs.com/demo)
+- 📖 [Read the documentation](https://revealjs.com/markup/)
+- 🖌 [Try the visual editor for reveal.js at Slides.com](https://slides.com/)
+- 🎬 [Watch the reveal.js video course (paid)](https://revealjs.com/course)
 
-Copyright (C) 2011-2020 Hakim El Hattab, https://hakim.se
+--- 
+<div align="center">
+  MIT licensed | Copyright © 2011-2024 Hakim El Hattab, https://hakim.se
+</div>

css/layout.scss

@@ -16,9 +16,16 @@
 	box-sizing: border-box;
 }
 
+// Text that auto-fits its container
+.reveal .r-fit-text {
+	display: inline-block; // https://github.com/rikschennink/fitty#performance
+	white-space: nowrap;
+}
+
 // Stack multiple elements on top of each other
 .reveal .r-stack {
 	display: grid;
+	grid-template-rows: 100%;
 }
 
 .reveal .r-stack > * {
@@ -30,20 +37,34 @@
 .reveal .r-vstack,
 .reveal .r-hstack {
 	display: flex;
+
+	img, video {
+		min-width: 0;
+		min-height: 0;
+		object-fit: contain;
+	}
 }
 
 .reveal .r-vstack {
 	flex-direction: column;
+	align-items: center;
+	justify-content: center;
 }
 
 .reveal .r-hstack {
 	flex-direction: row;
-}
-
-.reveal .items-center {
 	align-items: center;
+	justify-content: center;
 }
 
-.reveal .justify-center {
-	justify-content: center;
-}
+// Naming based on tailwindcss
+.reveal .items-stretch { align-items: stretch; }
+.reveal .items-start { align-items: flex-start; }
+.reveal .items-center { align-items: center; }
+.reveal .items-end { align-items: flex-end; }
+
+.reveal .justify-between { justify-content: space-between; }
+.reveal .justify-around { justify-content: space-around; }
+.reveal .justify-start { justify-content: flex-start; }
+.reveal .justify-center { justify-content: center; }
+.reveal .justify-end { justify-content: flex-end; }

css/print/paper.scss

@@ -1,42 +1,30 @@
-/* Default Print Stylesheet Template
-   by Rob Glazebrook of CSSnewbie.com
-   Last Updated: June 4, 2008
-
-   Feel free (nay, compelled) to edit, append, and
-   manipulate this file as you see fit. */
 
 @media print {
 	html:not(.print-pdf) {
-
-		background: #fff;
+		overflow: visible;
 		width: auto;
 		height: auto;
-		overflow: visible;
 
 		body {
-			background: #fff;
-			font-size: 20pt;
-			width: auto;
-			height: auto;
-			border: 0;
-			margin: 0 5%;
+			margin: 0;
 			padding: 0;
 			overflow: visible;
-			float: none !important;
 		}
+	}
+
+	html:not(.print-pdf) .reveal {
+		background: #fff;
+		font-size: 20pt;
 
-		.nestedarrow,
 		.controls,
-		.fork-reveal,
-		.share-reveal,
 		.state-background,
-		.reveal .progress,
-		.reveal .backgrounds,
-		.reveal .slide-number {
+		.progress,
+		.backgrounds,
+		.slide-number {
 			display: none !important;
 		}
 
-		body, p, td, li {
+		p, td, li {
 			font-size: 20pt!important;
 			color: #000;
 		}
@@ -49,7 +37,6 @@
 			letter-spacing: normal;
 		}
 
-		/* Need to reduce the size of the fonts for printing */
 		h1 { font-size: 28pt !important; }
 		h2 { font-size: 24pt !important; }
 		h3 { font-size: 22pt !important; }
@@ -74,18 +61,19 @@
 			margin: 0;
 			text-align: left !important;
 		}
-		.reveal pre,
-		.reveal table {
+		pre,
+		table {
 			margin-left: 0;
 			margin-right: 0;
 		}
-		.reveal pre code {
+		pre code {
 			padding: 20px;
 		}
-		.reveal blockquote {
+		blockquote {
 			margin: 20px 0;
 		}
-		.reveal .slides {
+
+		.slides {
 			position: static !important;
 			width: auto !important;
 			height: auto !important;
@@ -106,7 +94,7 @@
 
 			perspective-origin: 50% 50%;
 		}
-		.reveal .slides section {
+		.slides section {
 			visibility: visible !important;
 			position: static !important;
 			width: auto !important;
@@ -129,19 +117,24 @@
 			transform: none !important;
 			transition: none !important;
 		}
-		.reveal .slides section.stack {
+		.slides section.stack {
 			padding: 0 !important;
 		}
-		.reveal section:last-of-type {
+		.slides section:last-of-type {
 			page-break-after: avoid !important;
 		}
-		.reveal section .fragment {
+		.slides section .fragment {
 			opacity: 1 !important;
 			visibility: visible !important;
 
 			transform: none !important;
 		}
-		.reveal section img {
+
+		.r-fit-text {
+			white-space: normal !important;
+		}
+
+		section img {
 			display: block;
 			margin: 15px 0px;
 			background: rgba(255,255,255,1);
@@ -149,11 +142,11 @@
 			box-shadow: none;
 		}
 
-		.reveal section small {
+		section small {
 			font-size: 0.8em;
 		}
 
-		.reveal .hljs {
+		.hljs {
 			max-height: 100%;
 			white-space: pre-wrap;
 			word-wrap: break-word;
@@ -161,11 +154,11 @@
 			font-size: 15pt;
 		}
 
-		.reveal .hljs .hljs-ln-numbers {
+		.hljs .hljs-ln-numbers {
 			white-space: nowrap;
 		}
 
-		.reveal .hljs td {
+		.hljs td {
 			font-size: inherit !important;
 			color: inherit !important;
 		}

css/print/pdf.scss

@@ -2,10 +2,10 @@
  * This stylesheet is used to print reveal.js
  * presentations to PDF.
  *
- * https://revealjs.netlify.app/pdf-export/
+ * https://revealjs.com/pdf-export/
  */
 
-html.print-pdf {
+html.reveal-print {
 	* {
 		-webkit-print-color-adjust: exact;
 	}
@@ -30,30 +30,14 @@ html.print-pdf {
 	.reveal .progress,
 	.reveal .playback,
 	.reveal.overview,
-	.fork-reveal,
-	.share-reveal,
 	.state-background {
 		display: none !important;
 	}
 
-	h1, h2, h3, h4, h5, h6 {
-		text-shadow: 0 0 0 #000 !important;
-	}
-
 	.reveal pre code {
 		overflow: hidden !important;
-		font-family: Courier, 'Courier New', monospace !important;
 	}
 
-	ul, ol, div, p {
-		visibility: visible;
-		position: static;
-		width: auto;
-		height: auto;
-		display: block;
-		overflow: visible;
-		margin: auto;
-	}
 	.reveal {
 		width: auto !important;
 		height: auto !important;
@@ -86,6 +70,10 @@ html.print-pdf {
 		page-break-after: always;
 	}
 
+	.reveal .slides .pdf-page:last-of-type {
+		page-break-after: avoid;
+	}
+
 	.reveal .slides section {
 		visibility: visible !important;
 		display: block !important;
@@ -115,12 +103,10 @@ html.print-pdf {
 		box-shadow: none;
 	}
 
-	.reveal .roll {
-		overflow: visible;
-		line-height: 1em;
-	}
-
 	/* Slide backgrounds are placed inside of their slide when exporting to PDF */
+	.reveal .backgrounds {
+		display: none;
+	}
 	.reveal .slide-background {
 		display: block !important;
 		position: absolute;
@@ -163,6 +149,7 @@ html.print-pdf {
 		display: block;
 		position: absolute;
 		font-size: 14px;
+		visibility: visible;
 	}
 
 	/* This accessibility tool is not useful in PDF and breaks it visually */

css/theme/README.md

@@ -1,6 +1,6 @@
 ## Dependencies
 
-Themes are written using Sass to keep things modular and reduce the need for repeated selectors across files. Make sure that you have the reveal.js development environment installed before proceeding: https://revealjs.netlify.app/installation/#full-setup
+Themes are written using Sass to keep things modular and reduce the need for repeated selectors across files. Make sure that you have the reveal.js development environment installed before proceeding: https://revealjs.com/installation/#full-setup
 
 ## Creating a Theme
 

css/theme/source/beige.scss

@@ -6,6 +6,7 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -13,7 +14,7 @@
 
 
 // Include theme-specific fonts
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 
@@ -23,17 +24,22 @@ $headingColor: #333;
 $headingTextShadow: none;
 $backgroundColor: #f7f3de;
 $linkColor: #8b743d;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 $selectionBackgroundColor: rgba(79, 64, 28, 0.99);
 $heading1TextShadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0,0,0,.1), 0 0 5px rgba(0,0,0,.1), 0 1px 3px rgba(0,0,0,.3), 0 3px 5px rgba(0,0,0,.2), 0 5px 10px rgba(0,0,0,.25), 0 20px 20px rgba(0,0,0,.15);
 
+$overlayElementBgColor: 0, 0, 0;
+$overlayElementFgColor: 240, 240, 240;
+
 // Background generator
 @mixin bodyBackground() {
 	@include radial-gradient( rgba(247,242,211,1), rgba(255,255,255,1) );
 }
 
+// Change text colors against dark slide backgrounds
+@include dark-bg-text-color(#fff);
 
 
 // Theme template ------------------------------
 @import "../template/theme";
-// ---------------------------------------------
+// ---------------------------------------------

css/theme/source/black-contrast.scss

@@ -0,0 +1,50 @@
+/**
+ * Black compact & high contrast reveal.js theme, with headers not in capitals.
+ *
+ * By Peter Kehl. Based on black.(s)css by Hakim El Hattab, http://hakim.se
+ *
+ * - Keep the source similar to black.css - for easy comparison.
+ * - $mainFontSize controls code blocks, too (although under some ratio).
+ */
+
+
+// Default mixins and settings -----------------
+@use "sass:color";
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+// Include theme-specific fonts
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
+
+
+// Override theme settings (see ../template/settings.scss)
+$backgroundColor: #000000;
+
+$mainColor: #fff;
+$headingColor: #fff;
+
+$mainFontSize: 42px;
+$mainFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingTextShadow: none;
+$headingLetterSpacing: normal;
+$headingTextTransform: uppercase;
+$headingFontWeight: 600;
+$linkColor: #42affa;
+$linkColorHover: color.scale( $linkColor, $lightness: 15% );
+$selectionBackgroundColor: color.scale( $linkColor, $lightness: 25% );
+
+$heading1Size: 2.5em;
+$heading2Size: 1.6em;
+$heading3Size: 1.3em;
+$heading4Size: 1.0em;
+
+// Change text colors against light slide backgrounds
+@include light-bg-text-color(#000);
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------

css/theme/source/black.scss

@@ -6,13 +6,14 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
 
 
 // Include theme-specific fonts
-@import url(fonts/source-sans-pro/source-sans-pro.css);
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
 
 
 // Override theme settings (see ../template/settings.scss)
@@ -29,21 +30,18 @@ $headingLetterSpacing: normal;
 $headingTextTransform: uppercase;
 $headingFontWeight: 600;
 $linkColor: #42affa;
-$linkColorHover: lighten( $linkColor, 15% );
-$selectionBackgroundColor: lighten( $linkColor, 25% );
+$linkColorHover: color.scale( $linkColor, $lightness: 15% );
+$selectionBackgroundColor: rgba( $linkColor, 0.75 );
 
 $heading1Size: 2.5em;
 $heading2Size: 1.6em;
 $heading3Size: 1.3em;
 $heading4Size: 1.0em;
 
-section.has-light-background {
-	&, h1, h2, h3, h4, h5, h6 {
-		color: #222;
-	}
-}
+// Change text colors against light slide backgrounds
+@include light-bg-text-color(#222);
 
 
 // Theme template ------------------------------
 @import "../template/theme";
-// ---------------------------------------------
+// ---------------------------------------------

css/theme/source/blood.scss

@@ -10,7 +10,8 @@
  *
  */
 
- // Default mixins and settings -----------------
+// Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -40,12 +41,15 @@ $heading1TextShadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b
 
 // Links
 $linkColor: $blood;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 
 // Text selection
 $selectionBackgroundColor: $blood;
 $selectionColor: #fff;
 
+// Change text colors against dark slide backgrounds
+@include light-bg-text-color(#222);
+
 
 // Theme template ------------------------------
 @import "../template/theme";
@@ -58,6 +62,12 @@ $selectionColor: #fff;
     text-shadow: 1px 1px $coal;
 }
 
+section.has-light-background {
+	p, h1, h2, h3, h4 {
+		text-shadow: none;
+	}
+}
+
 .reveal h1,
 .reveal h2,
 .reveal h3,

css/theme/source/dracula.scss

@@ -0,0 +1,106 @@
+/**
+ * Dracula Dark theme for reveal.js.
+ * Based on https://draculatheme.com
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Include theme-specific fonts
+$systemFontsSansSerif: -apple-system,
+					   BlinkMacSystemFont,
+					   avenir next,
+					   avenir,
+					   segoe ui,
+					   helvetica neue,
+					   helvetica,
+					   Cantarell,
+					   Ubuntu,
+					   roboto,
+					   noto,
+					   arial,
+					   sans-serif;
+$systemFontsMono: Menlo,
+				  Consolas,
+				  Monaco,
+				  Liberation Mono,
+				  Lucida Console,
+				  monospace;
+
+/**
+ * Dracula colors by Zeno Rocha
+ * https://draculatheme.com/contribute
+ */
+html * {
+	color-profile: sRGB;
+	rendering-intent: auto;
+}
+
+$background: #282A36;
+$foreground: #F8F8F2;
+$selection: #44475A;
+$comment: #6272A4;
+$red: #FF5555;
+$orange: #FFB86C;
+$yellow: #F1FA8C;
+$green: #50FA7B;
+$purple: #BD93F9;
+$cyan: #8BE9FD;
+$pink: #FF79C6;
+
+
+
+// Override theme settings (see ../template/settings.scss)
+$mainColor: $foreground;
+$headingColor: $purple;
+$headingTextShadow: none;
+$headingTextTransform: none;
+$backgroundColor: $background;
+$linkColor: $pink;
+$linkColorHover: $cyan;
+$selectionBackgroundColor: $selection;
+$inlineCodeColor: $green;
+$listBulletColor: $cyan;
+
+$mainFont: $systemFontsSansSerif;
+$codeFont: "Fira Code", $systemFontsMono;
+
+// Change text colors against light slide backgrounds
+@include light-bg-text-color($background);
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
+
+// Define additional color effects based on Dracula spec
+// https://spec.draculatheme.com/
+:root {
+	--r-bold-color: #{$orange};
+	--r-italic-color: #{$yellow};
+	--r-inline-code-color: #{$inlineCodeColor};
+	--r-list-bullet-color: #{$listBulletColor};
+}
+
+.reveal {
+	strong, b {
+		color: var(--r-bold-color);
+	}
+	em, i, blockquote {
+		color: var(--r-italic-color);
+	}
+	code {
+		color: var(--r-inline-code-color);
+	}
+	// Dracula colored list bullets and numbers
+	ul, ol {
+		li::marker {
+			color: var(--r-list-bullet-color);
+		}
+	}
+}
+

css/theme/source/league.scss

@@ -15,7 +15,7 @@
 
 
 // Include theme-specific fonts
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 // Override theme settings (see ../template/settings.scss)
@@ -27,8 +27,10 @@ $heading1TextShadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b
 	@include radial-gradient( rgba(28,30,32,1), rgba(85,90,95,1) );
 }
 
+// Change text colors against light slide backgrounds
+@include light-bg-text-color(#222);
 
 
 // Theme template ------------------------------
 @import "../template/theme";
-// ---------------------------------------------
+// ---------------------------------------------

css/theme/source/moon.scss

@@ -5,6 +5,7 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -12,16 +13,12 @@
 
 
 // Include theme-specific fonts
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 /**
  * Solarized colors by Ethan Schoonover
  */
-html * {
-	color-profile: sRGB;
-	rendering-intent: auto;
-}
 
 // Solarized colors
 $base03:    #002b36;
@@ -47,10 +44,11 @@ $headingColor: $base2;
 $headingTextShadow: none;
 $backgroundColor: $base03;
 $linkColor: $blue;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 $selectionBackgroundColor: $magenta;
 
-
+// Change text colors against light slide backgrounds
+@include light-bg-text-color(#222);
 
 // Theme template ------------------------------
 @import "../template/theme";

css/theme/source/night.scss

@@ -6,6 +6,7 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -21,13 +22,16 @@ $backgroundColor: #111;
 
 $mainFont: 'Open Sans', sans-serif;
 $linkColor: #e7ad52;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 $headingFont: 'Montserrat', Impact, sans-serif;
 $headingTextShadow: none;
 $headingLetterSpacing: -0.03em;
 $headingTextTransform: none;
 $selectionBackgroundColor: #e7ad52;
 
+// Change text colors against light slide backgrounds
+@include light-bg-text-color(#222);
+
 
 // Theme template ------------------------------
 @import "../template/theme";

css/theme/source/serif.scss

@@ -7,6 +7,7 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -22,13 +23,19 @@ $headingTextShadow: none;
 $headingTextTransform: none;
 $backgroundColor: #F0F1EB;
 $linkColor: #51483D;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 $selectionBackgroundColor: #26351C;
 
+$overlayElementBgColor: 0, 0, 0;
+$overlayElementFgColor: 240, 240, 240;
+
 .reveal a {
   line-height: 1.3em;
 }
 
+// Change text colors against dark slide backgrounds
+@include dark-bg-text-color(#fff);
+
 
 // Theme template ------------------------------
 @import "../template/theme";

css/theme/source/simple.scss

@@ -8,6 +8,7 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -28,14 +29,14 @@ $headingTextShadow: none;
 $headingTextTransform: none;
 $backgroundColor: #fff;
 $linkColor: #00008B;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 $selectionBackgroundColor: rgba(0, 0, 0, 0.99);
 
-section.has-dark-background {
-	&, h1, h2, h3, h4, h5, h6 {
-		color: #fff;
-	}
-}
+$overlayElementBgColor: 0, 0, 0;
+$overlayElementFgColor: 240, 240, 240;
+
+// Change text colors against dark slide backgrounds
+@include dark-bg-text-color(#fff);
 
 
 // Theme template ------------------------------

css/theme/source/sky.scss

@@ -6,6 +6,7 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -26,9 +27,12 @@ $headingLetterSpacing: -0.08em;
 $headingTextShadow: none;
 $backgroundColor: #f7fbfc;
 $linkColor: #3b759e;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 $selectionBackgroundColor: #134674;
 
+$overlayElementBgColor: 0, 0, 0;
+$overlayElementFgColor: 240, 240, 240;
+
 // Fix links so they are not cut off
 .reveal a {
 	line-height: 1.3em;
@@ -39,6 +43,9 @@ $selectionBackgroundColor: #134674;
 	@include radial-gradient( #add9e4, #f7fbfc );
 }
 
+// Change text colors against dark slide backgrounds
+@include dark-bg-text-color(#fff);
+
 
 
 // Theme template ------------------------------

css/theme/source/solarized.scss

@@ -5,6 +5,7 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
@@ -12,7 +13,7 @@
 
 
 // Include theme-specific fonts
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 
@@ -48,9 +49,12 @@ $headingColor: $base01;
 $headingTextShadow: none;
 $backgroundColor: $base3;
 $linkColor: $blue;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 $selectionBackgroundColor: $magenta;
 
+$overlayElementBgColor: 0, 0, 0;
+$overlayElementFgColor: 240, 240, 240;
+
 // Background generator
 // @mixin bodyBackground() {
 // 	@include radial-gradient( rgba($base3,1), rgba(lighten($base3, 20%),1) );

css/theme/source/white-contrast.scss

@@ -0,0 +1,53 @@
+/**
+ * White compact & high contrast reveal.js theme, with headers not in capitals.
+ *
+ * By Peter Kehl. Based on white.(s)css by Hakim El Hattab, http://hakim.se
+ *
+ * - Keep the source similar to black.css - for easy comparison.
+ * - $mainFontSize controls code blocks, too (although under some ratio).
+ */
+
+
+// Default mixins and settings -----------------
+@use "sass:color";
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+// Include theme-specific fonts
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
+
+
+// Override theme settings (see ../template/settings.scss)
+$backgroundColor: #fff;
+
+$mainColor: #000;
+$headingColor: #000;
+
+$mainFontSize: 42px;
+$mainFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingTextShadow: none;
+$headingLetterSpacing: normal;
+$headingTextTransform: uppercase;
+$headingFontWeight: 600;
+$linkColor: #2a76dd;
+$linkColorHover: color.scale( $linkColor, $lightness: 15% );
+$selectionBackgroundColor: color.scale( $linkColor, $lightness: 25% );
+
+$heading1Size: 2.5em;
+$heading2Size: 1.6em;
+$heading3Size: 1.3em;
+$heading4Size: 1.0em;
+
+$overlayElementBgColor: 0, 0, 0;
+$overlayElementFgColor: 240, 240, 240;
+
+// Change text colors against dark slide backgrounds
+@include dark-bg-text-color(#fff);
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------

css/theme/source/white.scss

@@ -6,13 +6,14 @@
 
 
 // Default mixins and settings -----------------
+@use "sass:color";
 @import "../template/mixins";
 @import "../template/settings";
 // ---------------------------------------------
 
 
 // Include theme-specific fonts
-@import url(fonts/source-sans-pro/source-sans-pro.css);
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
 
 
 // Override theme settings (see ../template/settings.scss)
@@ -29,21 +30,21 @@ $headingLetterSpacing: normal;
 $headingTextTransform: uppercase;
 $headingFontWeight: 600;
 $linkColor: #2a76dd;
-$linkColorHover: lighten( $linkColor, 15% );
-$selectionBackgroundColor: lighten( $linkColor, 25% );
+$linkColorHover: color.scale( $linkColor, $lightness: 15% );
+$selectionBackgroundColor: color.scale( $linkColor, $lightness: 25% );
 
 $heading1Size: 2.5em;
 $heading2Size: 1.6em;
 $heading3Size: 1.3em;
 $heading4Size: 1.0em;
 
-section.has-dark-background {
-	&, h1, h2, h3, h4, h5, h6 {
-		color: #fff;
-	}
-}
+$overlayElementBgColor: 0, 0, 0;
+$overlayElementFgColor: 240, 240, 240;
+
+// Change text colors against dark slide backgrounds
+@include dark-bg-text-color(#fff);
 
 
 // Theme template ------------------------------
 @import "../template/theme";
-// ---------------------------------------------
+// ---------------------------------------------

css/theme/template/exposer.scss

@@ -1,27 +1,32 @@
-// Exposes theme's variables for easy re-use in CSS for plugin authors
+// Exposes theme's variables for easy reuse in CSS for plugin authors
+
+@use "sass:color";
 
 :root {
-  --background-color: #{$backgroundColor};
-  --main-font: #{$mainFont};
-  --main-font-size: #{$mainFontSize};
-  --main-color: #{$mainColor};
-  --block-margin: #{$blockMargin};
-  --heading-margin: #{$headingMargin};
-  --heading-font: #{$headingFont};
-  --heading-color: #{$headingColor};
-  --heading-line-height: #{$headingLineHeight};
-  --heading-letter-spacing: #{$headingLetterSpacing};
-  --heading-text-transform: #{$headingTextTransform};
-  --heading-text-shadow: #{$headingTextShadow};
-  --heading-font-weight: #{$headingFontWeight};
-  --heading1-text-shadow: #{$heading1TextShadow};
-  --heading1-size: #{$heading1Size};
-  --heading2-size: #{$heading2Size};
-  --heading3-size: #{$heading3Size};
-  --heading4-size: #{$heading4Size};
-  --code-font: #{$codeFont};
-  --link-color: #{$linkColor};
-  --link-color-hover: #{$linkColorHover};
-  --selection-background-color: #{$selectionBackgroundColor};
-  --selection-color: #{$selectionColor};
+  --r-background-color: #{$backgroundColor};
+  --r-main-font: #{$mainFont};
+  --r-main-font-size: #{$mainFontSize};
+  --r-main-color: #{$mainColor};
+  --r-block-margin: #{$blockMargin};
+  --r-heading-margin: #{$headingMargin};
+  --r-heading-font: #{$headingFont};
+  --r-heading-color: #{$headingColor};
+  --r-heading-line-height: #{$headingLineHeight};
+  --r-heading-letter-spacing: #{$headingLetterSpacing};
+  --r-heading-text-transform: #{$headingTextTransform};
+  --r-heading-text-shadow: #{$headingTextShadow};
+  --r-heading-font-weight: #{$headingFontWeight};
+  --r-heading1-text-shadow: #{$heading1TextShadow};
+  --r-heading1-size: #{$heading1Size};
+  --r-heading2-size: #{$heading2Size};
+  --r-heading3-size: #{$heading3Size};
+  --r-heading4-size: #{$heading4Size};
+  --r-code-font: #{$codeFont};
+  --r-link-color: #{$linkColor};
+  --r-link-color-dark: #{color.scale( $linkColor, $lightness: -15% )};
+  --r-link-color-hover: #{$linkColorHover};
+  --r-selection-background-color: #{$selectionBackgroundColor};
+  --r-selection-color: #{$selectionColor};
+  --r-overlay-element-bg-color: #{$overlayElementBgColor};
+  --r-overlay-element-fg-color: #{$overlayElementFgColor};
 }

css/theme/template/mixins.scss

@@ -26,4 +26,20 @@
 	background: -o-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
 	background: -ms-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
 	background: radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
+}
+
+@mixin light-bg-text-color( $color ) {
+	section.has-light-background {
+		&, h1, h2, h3, h4, h5, h6 {
+			color: $color;
+		}
+	}
+}
+
+@mixin dark-bg-text-color( $color ) {
+	section.has-dark-background {
+		&, h1, h2, h3, h4, h5, h6 {
+			color: $color;
+		}
+	}
 }

css/theme/template/settings.scss

@@ -1,3 +1,5 @@
+@use "sass:color";
+
 // Base settings for all themes that can optionally be
 // overridden by the super-theme
 
@@ -32,12 +34,17 @@ $codeFont: monospace;
 
 // Links and actions
 $linkColor: #13DAEC;
-$linkColorHover: lighten( $linkColor, 20% );
+$linkColorHover: color.scale( $linkColor, $lightness: 20% );
 
 // Text selection
 $selectionBackgroundColor: #FF5E99;
 $selectionColor: #fff;
 
+// Colors used for UI elements that are overlaid on top of
+// the presentation
+$overlayElementBgColor: 240, 240, 240;
+$overlayElementFgColor: 0, 0, 0;
+
 // Generates the presentation background, can be overridden
 // to return a background image or gradient
 @mixin bodyBackground() {

css/theme/template/theme.scss

@@ -8,25 +8,25 @@
 
 .reveal-viewport {
 	@include bodyBackground();
-	background-color: $backgroundColor;
+	background-color: var(--r-background-color);
 }
 
 .reveal {
-	font-family: $mainFont;
-	font-size: $mainFontSize;
+	font-family: var(--r-main-font);
+	font-size: var(--r-main-font-size);
 	font-weight: normal;
-	color: $mainColor;
+	color: var(--r-main-color);
 }
 
 .reveal ::selection {
-	color: $selectionColor;
-	background: $selectionBackgroundColor;
+	color: var(--r-selection-color);
+	background: var(--r-selection-background-color);
 	text-shadow: none;
 }
 
 .reveal ::-moz-selection {
-	color: $selectionColor;
-	background: $selectionBackgroundColor;
+	color: var(--r-selection-color);
+	background: var(--r-selection-background-color);
 	text-shadow: none;
 }
 
@@ -46,27 +46,27 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-	margin: $headingMargin;
-	color: $headingColor;
+	margin: var(--r-heading-margin);
+	color: var(--r-heading-color);
 
-	font-family: $headingFont;
-	font-weight: $headingFontWeight;
-	line-height: $headingLineHeight;
-	letter-spacing: $headingLetterSpacing;
+	font-family: var(--r-heading-font);
+	font-weight: var(--r-heading-font-weight);
+	line-height: var(--r-heading-line-height);
+	letter-spacing: var(--r-heading-letter-spacing);
 
-	text-transform: $headingTextTransform;
-	text-shadow: $headingTextShadow;
+	text-transform: var(--r-heading-text-transform);
+	text-shadow: var(--r-heading-text-shadow);
 
 	word-wrap: break-word;
 }
 
-.reveal h1 {font-size: $heading1Size; }
-.reveal h2 {font-size: $heading2Size; }
-.reveal h3 {font-size: $heading3Size; }
-.reveal h4 {font-size: $heading4Size; }
+.reveal h1 {font-size: var(--r-heading1-size); }
+.reveal h2 {font-size: var(--r-heading2-size); }
+.reveal h3 {font-size: var(--r-heading3-size); }
+.reveal h4 {font-size: var(--r-heading4-size); }
 
 .reveal h1 {
-	text-shadow: $heading1TextShadow;
+	text-shadow: var(--r-heading1-text-shadow);
 }
 
 
@@ -75,10 +75,20 @@
  *********************************************/
 
 .reveal p {
-	margin: $blockMargin 0;
+	margin: var(--r-block-margin) 0;
 	line-height: 1.3;
 }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+	margin-bottom: 0;
+}
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
@@ -140,7 +150,7 @@
 	display: block;
 	position: relative;
 	width: 70%;
-	margin: $blockMargin auto;
+	margin: var(--r-block-margin) auto;
 	padding: 5px;
 
 	font-style: italic;
@@ -160,11 +170,11 @@
 	display: block;
 	position: relative;
 	width: 90%;
-	margin: $blockMargin auto;
+	margin: var(--r-block-margin) auto;
 
 	text-align: left;
 	font-size: 0.55em;
-	font-family: $codeFont;
+	font-family: var(--r-code-font);
 	line-height: 1.2em;
 
 	word-wrap: break-word;
@@ -173,8 +183,9 @@
 }
 
 .reveal code {
-	font-family: $codeFont;
+	font-family: var(--r-code-font);
 	text-transform: none;
+	tab-size: 2;
 }
 
 .reveal pre code {
@@ -185,6 +196,14 @@
 	word-wrap: normal;
 }
 
+.reveal .code-wrapper {
+	white-space: normal;
+}
+
+.reveal .code-wrapper code {
+	white-space: pre;
+}
+
 .reveal table {
 	margin: auto;
 	border-collapse: collapse;
@@ -238,7 +257,7 @@
 }
 
 .reveal img {
-	margin: $blockMargin 0;
+	margin: var(--r-block-margin) 0;
 }
 
 
@@ -247,19 +266,20 @@
  *********************************************/
 
 .reveal a {
-	color: $linkColor;
+	color: var(--r-link-color);
 	text-decoration: none;
 	transition: color .15s ease;
 }
 	.reveal a:hover {
-		color: $linkColorHover;
+		color: var(--r-link-color-hover);
 		text-shadow: none;
 		border: none;
 	}
 
 .reveal .roll span:after {
 	color: #fff;
-	background: darken( $linkColor, 15% );
+	background: var(--r-link-color-dark);
+
 }
 
 
@@ -268,7 +288,7 @@
  *********************************************/
 
 .reveal .r-frame {
-	border: 4px solid $mainColor;
+	border: 4px solid var(--r-main-color);
 	box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
 }
 
@@ -277,7 +297,7 @@
 }
 
 .reveal a:hover .r-frame {
-	border-color: $linkColor;
+	border-color: var(--r-link-color);
 	box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
 }
 
@@ -287,7 +307,7 @@
  *********************************************/
 
 .reveal .controls {
-	color: $linkColor;
+	color: var(--r-link-color);
 }
 
 
@@ -297,17 +317,14 @@
 
 .reveal .progress {
 	background: rgba(0,0,0,0.2);
-	color: $linkColor;
+	color: var(--r-link-color);
 }
-	.reveal .progress span {
-		transition: width 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
-	}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
  @media print {
     .backgrounds {
-        background-color: $backgroundColor;
+        background-color: var(--r-background-color);
     }
 }

demo.html

@@ -19,7 +19,7 @@
 		<link rel="stylesheet" href="dist/theme/black.css" id="theme">
 
 		<!-- Theme used for syntax highlighting of code -->
-		<link rel="stylesheet" href="plugin/highlight/monokai.css" id="highlight-theme">
+		<link rel="stylesheet" href="plugin/highlight/monokai.css">
 	</head>
 
 	<body>
@@ -29,7 +29,9 @@
 			<!-- Any section element inside of this container is displayed as a slide -->
 			<div class="slides">
 				<section>
-					<h1>Reveal.js</h1>
+					<a href="https://revealjs.com">
+						<img src="https://static.slid.es/reveal/logo-v1/reveal-white-text.svg" alt="reveal.js logo" style="height: 180px; margin: 0 auto 4rem auto; background: transparent;" class="demo-logo">
+					</a>
 					<h3>The HTML Presentation Framework</h3>
 					<p>
 						<small>Created by <a href="http://hakim.se">Hakim El Hattab</a> and <a href="https://github.com/hakimel/reveal.js/graphs/contributors">contributors</a></small>
@@ -50,8 +52,8 @@
 						<p>Slides can be nested inside of each other.</p>
 						<p>Use the <em>Space</em> key to navigate through all slides.</p>
 						<br>
-						<a href="#" class="navigate-down">
-							<img class="r-frame" style="background: rgba(255,255,255,0.1);" width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
+						<a href="#/2/1" class="navigate-down">
+							<img class="r-frame" style="background: rgba(255,255,255,0.1);" width="178" height="238" data-src="https://static.slid.es/reveal/arrow.png" alt="Down arrow">
 						</a>
 					</section>
 					<section>
@@ -63,7 +65,7 @@
 						<p>That's it, time to go back up.</p>
 						<br>
 						<a href="#/2">
-							<img class="r-frame" style="background: rgba(255,255,255,0.1); transform: rotate(180deg);" width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Up arrow">
+							<img class="r-frame" style="background: rgba(255,255,255,0.1); transform: rotate(180deg);" width="178" height="238" data-src="https://static.slid.es/reveal/arrow.png" alt="Up arrow">
 						</a>
 					</section>
 				</section>
@@ -75,9 +77,16 @@
 					</p>
 				</section>
 
+				<section data-visibility="hidden">
+					<h2>Hidden Slides</h2>
+					<p>
+						This slide is visible in the source, but hidden when the presentation is viewed. You can show all hidden slides by setting the `showHiddenSlides` config option to `true`.
+					</p>
+				</section>
+
 				<section data-auto-animate>
 					<h2 data-id="code-title">Pretty Code</h2>
-					<pre data-id="code-animation"><code class="hljs" data-trim data-line-numbers>
+					<pre data-id="code-animation"><code class="hljs javascript" data-trim data-line-numbers>
 						import React, { useState } from 'react';
 
 						function Example() {
@@ -92,20 +101,20 @@
 				</section>
 
 				<section data-auto-animate>
-					<h2 data-id="code-title">With animations</h2>
-					<pre data-id="code-animation"><code class="hljs" data-trim data-line-numbers="|4,8-11|17|22-24">
+					<h2 data-id="code-title">With Animations</h2>
+					<pre data-id="code-animation"><code class="hljs javascript" data-trim data-line-numbers="|4,8-11|17|22-24"><script type="text/template">
 						import React, { useState } from 'react';
 
 						function Example() {
 						  const [count, setCount] = useState(0);
 
 						  return (
-						    &lt;div&gt;
-						      &lt;p&gt;You clicked {count} times&lt;/p&gt;
-						      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;
+						    <div>
+						      <p>You clicked {count} times</p>
+						      <button onClick={() => setCount(count + 1)}>
 						        Click me
-						      &lt;/button&gt;
-						    &lt;/div&gt;
+						      </button>
+						    </div>
 						  );
 						}
 
@@ -113,15 +122,15 @@
 						  const [count, setCount] = useState(0);
 
 						  return (
-						    &lt;div&gt;
-						      &lt;p&gt;You clicked {count} times&lt;/p&gt;
-						      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;
+						    <div>
+						      <p>You clicked {count} times</p>
+						      <button onClick={() => setCount(count + 1)}>
 						        Click me
-						      &lt;/button&gt;
-						    &lt;/div&gt;
+						      </button>
+						    </div>
 						  );
 						}
-					</code></pre>
+					</script></code></pre>
 				</section>
 
 				<section>
@@ -139,7 +148,7 @@
 
 				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
 					<h2>Auto-Animate</h2>
-					<p>Automatically animate matching elements across slides with <a href="https://revealjs.netlify.app/auto-animate/">Auto-Animate</a>.</p>
+					<p>Automatically animate matching elements across slides with <a href="https://revealjs.com/auto-animate/">Auto-Animate</a>.</p>
 					<div class="r-hstack justify-center">
 						<div data-id="box1" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
 						<div data-id="box2" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
@@ -156,9 +165,9 @@
 				</section>
 				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
 					<div class="r-stack">
-						<div data-id="box1" style="background: cyan; width: 300px; height: 300px; border-radius: 200px;"></div>
-						<div data-id="box2" style="background: magenta; width: 200px; height: 200px; border-radius: 200px;"></div>
-						<div data-id="box3" style="background: yellow; width: 100px; height: 100px; border-radius: 200px;"></div>
+						<div data-id="box1" style="background: cyan; width: 300px; height: 300px;"></div>
+						<div data-id="box2" style="background: magenta; width: 200px; height: 200px;"></div>
+						<div data-id="box3" style="background: yellow; width: 100px; height: 100px;"></div>
 					</div>
 					<h2 style="margin-top: 20px;">Auto-Animate</h2>
 				</section>
@@ -172,22 +181,27 @@
 
 				<section data-markdown>
 					<script type="text/template">
-						## Markdown support
+						## Markdown Support
 
 						Write content using inline or external Markdown.
-						Instructions and more info available in the [readme](https://revealjs.netlify.app/markdown/).
+						Instructions and more info available in the [docs](https://revealjs.com/markdown/).
 
-						```[]
+						```html []
 						<section data-markdown>
-						  ## Markdown support
+						  ## Markdown Support
 
 						  Write content using inline or external Markdown.
-						  Instructions and more info available in the [readme](https://revealjs.netlify.app/markdown/).
+						  Instructions and more info available in the [docs](https://revealjs.com/markdown/).
 						</section>
 						```
 					</script>
 				</section>
 
+				<section>
+					<p>Add the <code>r-fit-text</code> class to auto-size text</p>
+					<h2 class="r-fit-text">FIT TEXT</h2>
+				</section>
+
 				<section>
 					<section id="fragments">
 						<h2>Fragments</h2>
@@ -235,17 +249,17 @@
 					<p>
 						reveal.js comes with a few themes built in: <br>
 						<!-- Hacks to swap themes after the page has loaded. Not flexible and only intended for the reveal.js demo deck. -->
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/black.css'); return false;">Black (default)</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/white.css'); return false;">White</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/league.css'); return false;">League</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/sky.css'); return false;">Sky</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/beige.css'); return false;">Beige</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/simple.css'); return false;">Simple</a> <br>
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/serif.css'); return false;">Serif</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/blood.css'); return false;">Blood</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/night.css'); return false;">Night</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/moon.css'); return false;">Moon</a> -
-						<a href="#" onclick="document.getElementById('theme').setAttribute('href','css/theme/solarized.css'); return false;">Solarized</a>
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/black.css'); return false;">Black (default)</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/white.css'); return false;">White</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/league.css'); return false;">League</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/sky.css'); return false;">Sky</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/beige.css'); return false;">Beige</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/simple.css'); return false;">Simple</a> <br>
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/serif.css'); return false;">Serif</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/blood.css'); return false;">Blood</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/night.css'); return false;">Night</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/moon.css'); return false;">Moon</a> -
+						<a href="#/themes" onclick="document.getElementById('theme').setAttribute('href','dist/theme/solarized.css'); return false;">Solarized</a>
 					</p>
 				</section>
 
@@ -256,18 +270,23 @@
 							Set <code>data-background="#dddddd"</code> on a slide to change the background color. All CSS color formats are supported.
 						</p>
 						<a href="#" class="navigate-down">
-							<img class="r-frame" style="background: rgba(255,255,255,0.1);" width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
+							<img class="r-frame" style="background: rgba(255,255,255,0.1);" width="178" height="238" data-src="https://static.slid.es/reveal/arrow.png" alt="Down arrow">
 						</a>
 					</section>
-					<section data-background="https://s3.amazonaws.com/hakim-static/reveal-js/image-placeholder.png">
+					<section data-background-gradient="linear-gradient(to bottom, #283b95, #17b2c3)">
+						<h2>Gradient Backgrounds</h2>
+						<pre><code class="hljs html wrap">&lt;section data-background-gradient=
+							"linear-gradient(to bottom, #ddd, #191919)"&gt;</code></pre>
+					</section>
+					<section data-background="https://static.slid.es/reveal/image-placeholder.png">
 						<h2>Image Backgrounds</h2>
 						<pre><code class="hljs html">&lt;section data-background="image.png"&gt;</code></pre>
 					</section>
-					<section data-background="https://s3.amazonaws.com/hakim-static/reveal-js/image-placeholder.png" data-background-repeat="repeat" data-background-size="100px">
+					<section data-background="https://static.slid.es/reveal/image-placeholder.png" data-background-repeat="repeat" data-background-size="100px">
 						<h2>Tiled Backgrounds</h2>
 						<pre><code class="hljs html" style="word-wrap: break-word;">&lt;section data-background="image.png" data-background-repeat="repeat" data-background-size="100px"&gt;</code></pre>
 					</section>
-					<section data-background-video="https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.mp4,https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.webm" data-background-color="#000000">
+					<section data-background-video="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4" data-background-color="#000000">
 						<div style="background-color: rgba(0, 0, 0, 0.9); color: #fff; padding: 20px;">
 							<h2>Video Backgrounds</h2>
 							<pre><code class="hljs html" style="word-wrap: break-word;">&lt;section data-background-video="video.mp4,video.webm"&gt;</code></pre>
@@ -371,7 +390,7 @@
 
 				<section>
 					<h2>Speaker View</h2>
-					<p>There's a <a href="https://revealjs.netlify.app/speaker-view/">speaker view</a>. It includes a timer, preview of the upcoming slide as well as your speaker notes.</p>
+					<p>There's a <a href="https://revealjs.com/speaker-view/">speaker view</a>. It includes a timer, preview of the upcoming slide as well as your speaker notes.</p>
 					<p>Press the <em>S</em> key to try it out.</p>
 
 					<aside class="notes">
@@ -381,7 +400,7 @@
 
 				<section>
 					<h2>Export to PDF</h2>
-					<p>Presentations can be <a href="https://revealjs.netlify.app/pdf-export/">exported to PDF</a>, here's an example:</p>
+					<p>Presentations can be <a href="https://revealjs.com/pdf-export/">exported to PDF</a>, here's an example:</p>
 					<iframe data-src="https://www.slideshare.net/slideshow/embed_code/42840540" width="445" height="355" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:3px solid #666; margin-bottom:5px; max-width: 100%;" allowfullscreen> </iframe>
 				</section>
 
@@ -417,10 +436,10 @@ Reveal.on( 'customevent', function() {
 					<h2>Much more</h2>
 					<ul>
 						<li>Right-to-left support</li>
-						<li><a href="https://revealjs.netlify.app/api/">Extensive JavaScript API</a></li>
-						<li><a href="https://revealjs.netlify.app/auto-slide/">Auto-progression</a></li>
-						<li><a href="https://revealjs.netlify.app/backgrounds/#parallax-background">Parallax backgrounds</a></li>
-						<li><a href="https://revealjs.netlify.app/keyboard/">Custom keyboard bindings</a></li>
+						<li><a href="https://revealjs.com/api/">Extensive JavaScript API</a></li>
+						<li><a href="https://revealjs.com/auto-slide/">Auto-progression</a></li>
+						<li><a href="https://revealjs.com/backgrounds/#parallax-background">Parallax backgrounds</a></li>
+						<li><a href="https://revealjs.com/keyboard/">Custom keyboard bindings</a></li>
 					</ul>
 				</section>
 
@@ -445,14 +464,14 @@ Reveal.on( 'customevent', function() {
 		<script>
 
 			// Also available as an ES module, see:
-			// https://revealjs.netlify.app/initialization/
+			// https://revealjs.com/initialization/
 			Reveal.initialize({
 				controls: true,
 				progress: true,
 				center: true,
 				hash: true,
 
-				// Learn about plugins: https://revealjs.netlify.app/plugins/
+				// Learn about plugins: https://revealjs.com/plugins/
 				plugins: [ RevealZoom, RevealNotes, RevealSearch, RevealMarkdown, RevealHighlight ]
 			});
 

dist/theme/beige.css

@@ -3,66 +3,79 @@
  *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
+  color: #fff;
+}
+
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #f7f3de;
-  --main-font: Lato, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #333;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: League Gothic, Impact, sans-serif;
-  --heading-color: #333;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: none;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #8b743d;
-  --link-color-hover: #c0a86e;
-  --selection-background-color: rgba(79, 64, 28, 0.99);
-  --selection-color: #fff; }
+  --r-background-color: #f7f3de;
+  --r-main-font: Lato, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #333;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: League Gothic, Impact, sans-serif;
+  --r-heading-color: #333;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #8b743d;
+  --r-link-color-dark: rgb(118.15, 98.6, 51.85);
+  --r-link-color-hover: rgb(179.36, 150.84, 82.64);
+  --r-selection-background-color: rgba(79, 64, 28, 0.99);
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 0, 0, 0;
+  --r-overlay-element-fg-color: 240, 240, 240;
+}
 
 .reveal-viewport {
-  background: #f7f2d3;
-  background: -moz-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
-  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, white), color-stop(100%, #f7f2d3));
-  background: -webkit-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
-  background: -o-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
-  background: -ms-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
-  background: radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
-  background-color: #f7f3de; }
+  background: rgb(247, 242, 211);
+  background: -moz-radial-gradient(center, circle cover, rgb(255, 255, 255) 0%, rgb(247, 242, 211) 100%);
+  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgb(255, 255, 255)), color-stop(100%, rgb(247, 242, 211)));
+  background: -webkit-radial-gradient(center, circle cover, rgb(255, 255, 255) 0%, rgb(247, 242, 211) 100%);
+  background: -o-radial-gradient(center, circle cover, rgb(255, 255, 255) 0%, rgb(247, 242, 211) 100%);
+  background: -ms-radial-gradient(center, circle cover, rgb(255, 255, 255) 0%, rgb(247, 242, 211) 100%);
+  background: radial-gradient(center, circle cover, rgb(255, 255, 255) 0%, rgb(247, 242, 211) 100%);
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Lato", sans-serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #333; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: rgba(79, 64, 28, 0.99);
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: rgba(79, 64, 28, 0.99);
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -73,220 +86,281 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #333;
-  font-family: "League Gothic", Impact, sans-serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: uppercase;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15); }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #8b743d;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #c0a86e;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #564826; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #333;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #8b743d;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #8b743d; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #8b743d; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #f7f3de; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/black-contrast.css

@@ -0,0 +1,362 @@
+/**
+ * Black compact & high contrast reveal.js theme, with headers not in capitals.
+ *
+ * By Peter Kehl. Based on black.(s)css by Hakim El Hattab, http://hakim.se
+ *
+ * - Keep the source similar to black.css - for easy comparison.
+ * - $mainFontSize controls code blocks, too (although under some ratio).
+ */
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
+section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
+  color: #000;
+}
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+:root {
+  --r-background-color: #000000;
+  --r-main-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-main-font-size: 42px;
+  --r-main-color: #fff;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-heading-color: #fff;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: 600;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 2.5em;
+  --r-heading2-size: 1.6em;
+  --r-heading3-size: 1.3em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #42affa;
+  --r-link-color-dark: rgb(19.8216494845, 155.4536082474, 248.7783505155);
+  --r-link-color-hover: rgb(94.35, 187, 250.75);
+  --r-selection-background-color: rgb(113.25, 195, 251.25);
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 240, 240, 240;
+  --r-overlay-element-fg-color: 0, 0, 0;
+}
+
+.reveal-viewport {
+  background: #000000;
+  background-color: var(--r-background-color);
+}
+
+.reveal {
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
+  font-weight: normal;
+  color: var(--r-main-color);
+}
+
+.reveal ::selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal ::-moz-selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit;
+}
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
+
+.reveal h1 {
+  font-size: var(--r-heading1-size);
+}
+
+.reveal h2 {
+  font-size: var(--r-heading2-size);
+}
+
+.reveal h3 {
+  font-size: var(--r-heading3-size);
+}
+
+.reveal h4 {
+  font-size: var(--r-heading4-size);
+}
+
+.reveal h1 {
+  text-shadow: var(--r-heading1-text-shadow);
+}
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%;
+}
+
+.reveal strong,
+.reveal b {
+  font-weight: bold;
+}
+
+.reveal em {
+  font-style: italic;
+}
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em;
+}
+
+.reveal ol {
+  list-style-type: decimal;
+}
+
+.reveal ul {
+  list-style-type: disc;
+}
+
+.reveal ul ul {
+  list-style-type: square;
+}
+
+.reveal ul ul ul {
+  list-style-type: circle;
+}
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px;
+}
+
+.reveal dt {
+  font-weight: bold;
+}
+
+.reveal dd {
+  margin-left: 40px;
+}
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: var(--r-block-margin) auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block;
+}
+
+.reveal q {
+  font-style: italic;
+}
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: var(--r-block-margin) auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: var(--r-code-font);
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
+
+.reveal code {
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+.reveal table th {
+  font-weight: bold;
+}
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid;
+}
+
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
+
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none;
+}
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller;
+}
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller;
+}
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top;
+}
+
+.reveal small * {
+  vertical-align: top;
+}
+
+.reveal img {
+  margin: var(--r-block-margin) 0;
+}
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: var(--r-link-color);
+  text-decoration: none;
+  transition: color 0.15s ease;
+}
+
+.reveal a:hover {
+  color: var(--r-link-color-hover);
+  text-shadow: none;
+  border: none;
+}
+
+.reveal .roll span:after {
+  color: #fff;
+  background: var(--r-link-color-dark);
+}
+
+/*********************************************
+ * Frame helper
+ *********************************************/
+.reveal .r-frame {
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
+
+.reveal a .r-frame {
+  transition: all 0.15s linear;
+}
+
+.reveal a:hover .r-frame {
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/black.css

@@ -3,62 +3,72 @@
  *
  * By Hakim El Hattab, http://hakim.se
  */
-@import url(fonts/source-sans-pro/source-sans-pro.css);
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
 section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
-  color: #222; }
+  color: #222;
+}
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #191919;
-  --main-font: Source Sans Pro, Helvetica, sans-serif;
-  --main-font-size: 42px;
-  --main-color: #fff;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: Source Sans Pro, Helvetica, sans-serif;
-  --heading-color: #fff;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: none;
-  --heading-font-weight: 600;
-  --heading1-text-shadow: none;
-  --heading1-size: 2.5em;
-  --heading2-size: 1.6em;
-  --heading3-size: 1.3em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #42affa;
-  --link-color-hover: #8dcffc;
-  --selection-background-color: #bee4fd;
-  --selection-color: #fff; }
+  --r-background-color: #191919;
+  --r-main-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-main-font-size: 42px;
+  --r-main-color: #fff;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-heading-color: #fff;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: 600;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 2.5em;
+  --r-heading2-size: 1.6em;
+  --r-heading3-size: 1.3em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #42affa;
+  --r-link-color-dark: rgb(19.8216494845, 155.4536082474, 248.7783505155);
+  --r-link-color-hover: rgb(94.35, 187, 250.75);
+  --r-selection-background-color: rgba(66, 175, 250, 0.75);
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 240, 240, 240;
+  --r-overlay-element-fg-color: 0, 0, 0;
+}
 
 .reveal-viewport {
   background: #191919;
-  background-color: #191919; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Source Sans Pro", Helvetica, sans-serif;
-  font-size: 42px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #fff; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #bee4fd;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #bee4fd;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -69,220 +79,281 @@ section.has-light-background, section.has-light-background h1, section.has-light
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #fff;
-  font-family: "Source Sans Pro", Helvetica, sans-serif;
-  font-weight: 600;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: uppercase;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 2.5em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 1.6em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.3em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #42affa;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #8dcffc;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #068de9; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #fff;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #42affa;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #42affa; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #42affa; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #191919; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/blood.css

@@ -10,58 +10,71 @@
  *
  */
 @import url(https://fonts.googleapis.com/css?family=Ubuntu:300,700,300italic,700italic);
+section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
+  color: #222;
+}
+
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #222;
-  --main-font: Ubuntu, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #eee;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: Ubuntu, sans-serif;
-  --heading-color: #eee;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: 2px 2px 2px #222;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #a23;
-  --link-color-hover: #dd5566;
-  --selection-background-color: #a23;
-  --selection-color: #fff; }
+  --r-background-color: #222;
+  --r-main-font: Ubuntu, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #eee;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Ubuntu, sans-serif;
+  --r-heading-color: #eee;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: 2px 2px 2px #222;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #a23;
+  --r-link-color-dark: rgb(144.5, 28.9, 43.35);
+  --r-link-color-hover: rgb(214.2, 51, 71.4);
+  --r-selection-background-color: #a23;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 240, 240, 240;
+  --r-overlay-element-fg-color: 0, 0, 0;
+}
 
 .reveal-viewport {
   background: #222;
-  background-color: #222; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: Ubuntu, "sans-serif";
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #eee; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #a23;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #a23;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -72,227 +85,292 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #eee;
-  font-family: Ubuntu, "sans-serif";
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: uppercase;
-  text-shadow: 2px 2px 2px #222;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15); }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #a23;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #dd5566;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #6a1520; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #eee;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #a23;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #a23; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #a23; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #222; } }
-
+    background-color: var(--r-background-color);
+  }
+}
 .reveal p {
   font-weight: 300;
-  text-shadow: 1px 1px #222; }
+  text-shadow: 1px 1px #222;
+}
+
+section.has-light-background p, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4 {
+  text-shadow: none;
+}
 
 .reveal h1,
 .reveal h2,
@@ -300,12 +378,15 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  font-weight: 700; }
+  font-weight: 700;
+}
 
 .reveal p code {
   background-color: #23241f;
   display: inline-block;
-  border-radius: 7px; }
+  border-radius: 7px;
+}
 
 .reveal small code {
-  vertical-align: baseline; }
+  vertical-align: baseline;
+}

dist/theme/dracula.css

@@ -0,0 +1,385 @@
+/**
+ * Dracula Dark theme for reveal.js.
+ * Based on https://draculatheme.com
+ */
+/**
+ * Dracula colors by Zeno Rocha
+ * https://draculatheme.com/contribute
+ */
+html * {
+  color-profile: sRGB;
+  rendering-intent: auto;
+}
+
+section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
+  color: #282A36;
+}
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+:root {
+  --r-background-color: #282A36;
+  --r-main-font: -apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, helvetica, Cantarell, Ubuntu, roboto, noto, arial, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #F8F8F2;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: League Gothic, Impact, sans-serif;
+  --r-heading-color: #BD93F9;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: none;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: Fira Code, Menlo, Consolas, Monaco, Liberation Mono, Lucida Console, monospace;
+  --r-link-color: #FF79C6;
+  --r-link-color-dark: rgb(255, 64.6, 174.0089552239);
+  --r-link-color-hover: #8BE9FD;
+  --r-selection-background-color: #44475A;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 240, 240, 240;
+  --r-overlay-element-fg-color: 0, 0, 0;
+}
+
+.reveal-viewport {
+  background: #282A36;
+  background-color: var(--r-background-color);
+}
+
+.reveal {
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
+  font-weight: normal;
+  color: var(--r-main-color);
+}
+
+.reveal ::selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal ::-moz-selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit;
+}
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
+
+.reveal h1 {
+  font-size: var(--r-heading1-size);
+}
+
+.reveal h2 {
+  font-size: var(--r-heading2-size);
+}
+
+.reveal h3 {
+  font-size: var(--r-heading3-size);
+}
+
+.reveal h4 {
+  font-size: var(--r-heading4-size);
+}
+
+.reveal h1 {
+  text-shadow: var(--r-heading1-text-shadow);
+}
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%;
+}
+
+.reveal strong,
+.reveal b {
+  font-weight: bold;
+}
+
+.reveal em {
+  font-style: italic;
+}
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em;
+}
+
+.reveal ol {
+  list-style-type: decimal;
+}
+
+.reveal ul {
+  list-style-type: disc;
+}
+
+.reveal ul ul {
+  list-style-type: square;
+}
+
+.reveal ul ul ul {
+  list-style-type: circle;
+}
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px;
+}
+
+.reveal dt {
+  font-weight: bold;
+}
+
+.reveal dd {
+  margin-left: 40px;
+}
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: var(--r-block-margin) auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block;
+}
+
+.reveal q {
+  font-style: italic;
+}
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: var(--r-block-margin) auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: var(--r-code-font);
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
+
+.reveal code {
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+.reveal table th {
+  font-weight: bold;
+}
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid;
+}
+
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
+
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none;
+}
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller;
+}
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller;
+}
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top;
+}
+
+.reveal small * {
+  vertical-align: top;
+}
+
+.reveal img {
+  margin: var(--r-block-margin) 0;
+}
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: var(--r-link-color);
+  text-decoration: none;
+  transition: color 0.15s ease;
+}
+
+.reveal a:hover {
+  color: var(--r-link-color-hover);
+  text-shadow: none;
+  border: none;
+}
+
+.reveal .roll span:after {
+  color: #fff;
+  background: var(--r-link-color-dark);
+}
+
+/*********************************************
+ * Frame helper
+ *********************************************/
+.reveal .r-frame {
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
+
+.reveal a .r-frame {
+  transition: all 0.15s linear;
+}
+
+.reveal a:hover .r-frame {
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: var(--r-background-color);
+  }
+}
+:root {
+  --r-bold-color: #FFB86C;
+  --r-italic-color: #F1FA8C;
+  --r-inline-code-color: #50FA7B;
+  --r-list-bullet-color: #8BE9FD;
+}
+
+.reveal strong, .reveal b {
+  color: var(--r-bold-color);
+}
+.reveal em, .reveal i, .reveal blockquote {
+  color: var(--r-italic-color);
+}
+.reveal code {
+  color: var(--r-inline-code-color);
+}
+.reveal ul li::marker, .reveal ol li::marker {
+  color: var(--r-list-bullet-color);
+}

dist/theme/fonts/league-gothic/league-gothic.css

@@ -1,10 +1,10 @@
 @font-face {
     font-family: 'League Gothic';
-    src: url('league-gothic.eot');
-    src: url('league-gothic.eot?#iefix') format('embedded-opentype'),
-         url('league-gothic.woff') format('woff'),
-         url('league-gothic.ttf') format('truetype');
+    src: url('./league-gothic.eot');
+    src: url('./league-gothic.eot?#iefix') format('embedded-opentype'),
+         url('./league-gothic.woff') format('woff'),
+         url('./league-gothic.ttf') format('truetype');
 
     font-weight: normal;
     font-style: normal;
-}
+}

dist/theme/fonts/source-sans-pro/source-sans-pro.css

@@ -1,39 +1,39 @@
 @font-face {
     font-family: 'Source Sans Pro';
-    src: url('source-sans-pro-regular.eot');
-    src: url('source-sans-pro-regular.eot?#iefix') format('embedded-opentype'),
-         url('source-sans-pro-regular.woff') format('woff'),
-         url('source-sans-pro-regular.ttf') format('truetype');
+    src: url('./source-sans-pro-regular.eot');
+    src: url('./source-sans-pro-regular.eot?#iefix') format('embedded-opentype'),
+         url('./source-sans-pro-regular.woff') format('woff'),
+         url('./source-sans-pro-regular.ttf') format('truetype');
     font-weight: normal;
     font-style: normal;
 }
 
 @font-face {
     font-family: 'Source Sans Pro';
-    src: url('source-sans-pro-italic.eot');
-    src: url('source-sans-pro-italic.eot?#iefix') format('embedded-opentype'),
-         url('source-sans-pro-italic.woff') format('woff'),
-         url('source-sans-pro-italic.ttf') format('truetype');
+    src: url('./source-sans-pro-italic.eot');
+    src: url('./source-sans-pro-italic.eot?#iefix') format('embedded-opentype'),
+         url('./source-sans-pro-italic.woff') format('woff'),
+         url('./source-sans-pro-italic.ttf') format('truetype');
     font-weight: normal;
     font-style: italic;
 }
 
 @font-face {
     font-family: 'Source Sans Pro';
-    src: url('source-sans-pro-semibold.eot');
-    src: url('source-sans-pro-semibold.eot?#iefix') format('embedded-opentype'),
-         url('source-sans-pro-semibold.woff') format('woff'),
-         url('source-sans-pro-semibold.ttf') format('truetype');
+    src: url('./source-sans-pro-semibold.eot');
+    src: url('./source-sans-pro-semibold.eot?#iefix') format('embedded-opentype'),
+         url('./source-sans-pro-semibold.woff') format('woff'),
+         url('./source-sans-pro-semibold.ttf') format('truetype');
     font-weight: 600;
     font-style: normal;
 }
 
 @font-face {
     font-family: 'Source Sans Pro';
-    src: url('source-sans-pro-semibolditalic.eot');
-    src: url('source-sans-pro-semibolditalic.eot?#iefix') format('embedded-opentype'),
-         url('source-sans-pro-semibolditalic.woff') format('woff'),
-         url('source-sans-pro-semibolditalic.ttf') format('truetype');
+    src: url('./source-sans-pro-semibolditalic.eot');
+    src: url('./source-sans-pro-semibolditalic.eot?#iefix') format('embedded-opentype'),
+         url('./source-sans-pro-semibolditalic.woff') format('woff'),
+         url('./source-sans-pro-semibolditalic.ttf') format('truetype');
     font-weight: 600;
     font-style: italic;
-}
+}

dist/theme/league.css

@@ -5,66 +5,79 @@
  *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
+  color: #222;
+}
+
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #2b2b2b;
-  --main-font: Lato, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #eee;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: League Gothic, Impact, sans-serif;
-  --heading-color: #eee;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: 0px 0px 6px rgba(0, 0, 0, 0.2);
-  --heading-font-weight: normal;
-  --heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #13DAEC;
-  --link-color-hover: #71e9f4;
-  --selection-background-color: #FF5E99;
-  --selection-color: #fff; }
+  --r-background-color: #2b2b2b;
+  --r-main-font: Lato, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #eee;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: League Gothic, Impact, sans-serif;
+  --r-heading-color: #eee;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: 0px 0px 6px rgba(0, 0, 0, 0.2);
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #13DAEC;
+  --r-link-color-dark: rgb(16.15, 185.3, 200.6);
+  --r-link-color-hover: rgb(66.2, 225.4, 239.8);
+  --r-selection-background-color: #FF5E99;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 240, 240, 240;
+  --r-overlay-element-fg-color: 0, 0, 0;
+}
 
 .reveal-viewport {
-  background: #1c1e20;
-  background: -moz-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
-  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, #555a5f), color-stop(100%, #1c1e20));
-  background: -webkit-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
-  background: -o-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
-  background: -ms-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
-  background: radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
-  background-color: #2b2b2b; }
+  background: rgb(28, 30, 32);
+  background: -moz-radial-gradient(center, circle cover, rgb(85, 90, 95) 0%, rgb(28, 30, 32) 100%);
+  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgb(85, 90, 95)), color-stop(100%, rgb(28, 30, 32)));
+  background: -webkit-radial-gradient(center, circle cover, rgb(85, 90, 95) 0%, rgb(28, 30, 32) 100%);
+  background: -o-radial-gradient(center, circle cover, rgb(85, 90, 95) 0%, rgb(28, 30, 32) 100%);
+  background: -ms-radial-gradient(center, circle cover, rgb(85, 90, 95) 0%, rgb(28, 30, 32) 100%);
+  background: radial-gradient(center, circle cover, rgb(85, 90, 95) 0%, rgb(28, 30, 32) 100%);
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Lato", sans-serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #eee; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #FF5E99;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #FF5E99;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -75,220 +88,281 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #eee;
-  font-family: "League Gothic", Impact, sans-serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: uppercase;
-  text-shadow: 0px 0px 6px rgba(0, 0, 0, 0.2);
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15); }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #13DAEC;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #71e9f4;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #0d99a5; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #eee;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #13DAEC;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #13DAEC; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #13DAEC; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #2b2b2b; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/moon.css

@@ -2,67 +2,76 @@
  * Solarized Dark theme for reveal.js.
  * Author: Achim Staebler
  */
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Solarized colors by Ethan Schoonover
  */
-html * {
-  color-profile: sRGB;
-  rendering-intent: auto; }
+section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
+  color: #222;
+}
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #002b36;
-  --main-font: Lato, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #93a1a1;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: League Gothic, Impact, sans-serif;
-  --heading-color: #eee8d5;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: none;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: none;
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #268bd2;
-  --link-color-hover: #78b9e6;
-  --selection-background-color: #d33682;
-  --selection-color: #fff; }
+  --r-background-color: #002b36;
+  --r-main-font: Lato, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #93a1a1;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: League Gothic, Impact, sans-serif;
+  --r-heading-color: #eee8d5;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #268bd2;
+  --r-link-color-dark: rgb(32.3, 118.15, 178.5);
+  --r-link-color-hover: rgb(77.5161290323, 162.8774193548, 222.8838709677);
+  --r-selection-background-color: #d33682;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 240, 240, 240;
+  --r-overlay-element-fg-color: 0, 0, 0;
+}
 
 .reveal-viewport {
   background: #002b36;
-  background-color: #002b36; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Lato", sans-serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #93a1a1; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #d33682;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #d33682;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -73,220 +82,281 @@ html * {
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #eee8d5;
-  font-family: "League Gothic", Impact, sans-serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: uppercase;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #268bd2;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #78b9e6;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #1a6091; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #93a1a1;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #268bd2;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #268bd2; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #268bd2; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #002b36; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/night.css

@@ -5,58 +5,71 @@
  */
 @import url(https://fonts.googleapis.com/css?family=Montserrat:700);
 @import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
+section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
+  color: #222;
+}
+
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #111;
-  --main-font: Open Sans, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #eee;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: Montserrat, Impact, sans-serif;
-  --heading-color: #eee;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: -0.03em;
-  --heading-text-transform: none;
-  --heading-text-shadow: none;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: none;
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #e7ad52;
-  --link-color-hover: #f3d7ac;
-  --selection-background-color: #e7ad52;
-  --selection-color: #fff; }
+  --r-background-color: #111;
+  --r-main-font: Open Sans, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #eee;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Montserrat, Impact, sans-serif;
+  --r-heading-color: #eee;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: -0.03em;
+  --r-heading-text-transform: none;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #e7ad52;
+  --r-link-color-dark: rgb(225.2802030457, 153.4573604061, 40.7697969543);
+  --r-link-color-hover: rgb(235.8, 189.4, 116.6);
+  --r-selection-background-color: #e7ad52;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 240, 240, 240;
+  --r-overlay-element-fg-color: 0, 0, 0;
+}
 
 .reveal-viewport {
   background: #111;
-  background-color: #111; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Open Sans", sans-serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #eee; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #e7ad52;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #e7ad52;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -67,220 +80,281 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #eee;
-  font-family: "Montserrat", Impact, sans-serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: -0.03em;
-  text-transform: none;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #e7ad52;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #f3d7ac;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #d08a1d; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #eee;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #e7ad52;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #e7ad52; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #e7ad52; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #111; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/serif.css

@@ -5,60 +5,74 @@
  * This theme is Copyright (C) 2012-2013 Owen Versteeg, http://owenversteeg.com - it is MIT licensed.
  */
 .reveal a {
-  line-height: 1.3em; }
+  line-height: 1.3em;
+}
+
+section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
+  color: #fff;
+}
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #F0F1EB;
-  --main-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
-  --main-font-size: 40px;
-  --main-color: #000;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
-  --heading-color: #383D3D;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: none;
-  --heading-text-shadow: none;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: none;
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #51483D;
-  --link-color-hover: #8b7c69;
-  --selection-background-color: #26351C;
-  --selection-color: #fff; }
+  --r-background-color: #F0F1EB;
+  --r-main-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #000;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
+  --r-heading-color: #383D3D;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: none;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #51483D;
+  --r-link-color-dark: rgb(68.85, 61.2, 51.85);
+  --r-link-color-hover: rgb(122.9830985915, 109.3183098592, 92.6169014085);
+  --r-selection-background-color: #26351C;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 0, 0, 0;
+  --r-overlay-element-fg-color: 240, 240, 240;
+}
 
 .reveal-viewport {
   background: #F0F1EB;
-  background-color: #F0F1EB; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Palatino Linotype", "Book Antiqua", Palatino, FreeSerif, serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #000; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #26351C;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #26351C;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -69,220 +83,281 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #383D3D;
-  font-family: "Palatino Linotype", "Book Antiqua", Palatino, FreeSerif, serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: none;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #51483D;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #8b7c69;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #25211c; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #000;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #51483D;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #51483D; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #51483D; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #F0F1EB; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/simple.css

@@ -8,60 +8,70 @@
 @import url(https://fonts.googleapis.com/css?family=News+Cycle:400,700);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
-  color: #fff; }
+  color: #fff;
+}
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #fff;
-  --main-font: Lato, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #000;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: News Cycle, Impact, sans-serif;
-  --heading-color: #000;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: none;
-  --heading-text-shadow: none;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: none;
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #00008B;
-  --link-color-hover: #0000f1;
-  --selection-background-color: rgba(0, 0, 0, 0.99);
-  --selection-color: #fff; }
+  --r-background-color: #fff;
+  --r-main-font: Lato, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #000;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: News Cycle, Impact, sans-serif;
+  --r-heading-color: #000;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: none;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #00008B;
+  --r-link-color-dark: rgb(0, 0, 118.15);
+  --r-link-color-hover: rgb(0, 0, 213.2);
+  --r-selection-background-color: rgba(0, 0, 0, 0.99);
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 0, 0, 0;
+  --r-overlay-element-fg-color: 240, 240, 240;
+}
 
 .reveal-viewport {
   background: #fff;
-  background-color: #fff; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Lato", sans-serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #000; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: rgba(0, 0, 0, 0.99);
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: rgba(0, 0, 0, 0.99);
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -72,220 +82,281 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #000;
-  font-family: "News Cycle", Impact, sans-serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: none;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #00008B;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #0000f1;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #00003f; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #000;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #00008B;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #00008B; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #00008B; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #fff; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/sky.css

@@ -6,35 +6,44 @@
 @import url(https://fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
 @import url(https://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
 .reveal a {
-  line-height: 1.3em; }
+  line-height: 1.3em;
+}
+
+section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
+  color: #fff;
+}
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #f7fbfc;
-  --main-font: Open Sans, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #333;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: Quicksand, sans-serif;
-  --heading-color: #333;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: -0.08em;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: none;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: none;
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #3b759e;
-  --link-color-hover: #74a7cb;
-  --selection-background-color: #134674;
-  --selection-color: #fff; }
+  --r-background-color: #f7fbfc;
+  --r-main-font: Open Sans, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #333;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Quicksand, sans-serif;
+  --r-heading-color: #333;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: -0.08em;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #3b759e;
+  --r-link-color-dark: rgb(50.15, 99.45, 134.3);
+  --r-link-color-hover: rgb(84.330875576, 146.9815668203, 191.269124424);
+  --r-selection-background-color: #134674;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 0, 0, 0;
+  --r-overlay-element-fg-color: 240, 240, 240;
+}
 
 .reveal-viewport {
   background: #add9e4;
@@ -44,28 +53,33 @@
   background: -o-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
   background: -ms-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
   background: radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
-  background-color: #f7fbfc; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Open Sans", sans-serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #333; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #134674;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #134674;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -76,220 +90,281 @@
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #333;
-  font-family: "Quicksand", sans-serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: -0.08em;
-  text-transform: uppercase;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #3b759e;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #74a7cb;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #264c66; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #333;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #3b759e;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #3b759e; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #3b759e; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #f7fbfc; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/solarized.css

@@ -2,67 +2,77 @@
  * Solarized Light theme for reveal.js.
  * Author: Achim Staebler
  */
-@import url(fonts/league-gothic/league-gothic.css);
+@import url(./fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Solarized colors by Ethan Schoonover
  */
 html * {
   color-profile: sRGB;
-  rendering-intent: auto; }
+  rendering-intent: auto;
+}
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #fdf6e3;
-  --main-font: Lato, sans-serif;
-  --main-font-size: 40px;
-  --main-color: #657b83;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: League Gothic, Impact, sans-serif;
-  --heading-color: #586e75;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: none;
-  --heading-font-weight: normal;
-  --heading1-text-shadow: none;
-  --heading1-size: 3.77em;
-  --heading2-size: 2.11em;
-  --heading3-size: 1.55em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #268bd2;
-  --link-color-hover: #78b9e6;
-  --selection-background-color: #d33682;
-  --selection-color: #fff; }
+  --r-background-color: #fdf6e3;
+  --r-main-font: Lato, sans-serif;
+  --r-main-font-size: 40px;
+  --r-main-color: #657b83;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: League Gothic, Impact, sans-serif;
+  --r-heading-color: #586e75;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: normal;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 3.77em;
+  --r-heading2-size: 2.11em;
+  --r-heading3-size: 1.55em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #268bd2;
+  --r-link-color-dark: rgb(32.3, 118.15, 178.5);
+  --r-link-color-hover: rgb(77.5161290323, 162.8774193548, 222.8838709677);
+  --r-selection-background-color: #d33682;
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 0, 0, 0;
+  --r-overlay-element-fg-color: 240, 240, 240;
+}
 
 .reveal-viewport {
   background: #fdf6e3;
-  background-color: #fdf6e3; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Lato", sans-serif;
-  font-size: 40px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #657b83; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #d33682;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #d33682;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -73,220 +83,281 @@ html * {
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #586e75;
-  font-family: "League Gothic", Impact, sans-serif;
-  font-weight: normal;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: uppercase;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 3.77em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 2.11em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.55em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #268bd2;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #78b9e6;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #1a6091; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #657b83;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #268bd2;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #268bd2; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #268bd2; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #fdf6e3; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/white-contrast.css

@@ -0,0 +1,362 @@
+/**
+ * White compact & high contrast reveal.js theme, with headers not in capitals.
+ *
+ * By Peter Kehl. Based on white.(s)css by Hakim El Hattab, http://hakim.se
+ *
+ * - Keep the source similar to black.css - for easy comparison.
+ * - $mainFontSize controls code blocks, too (although under some ratio).
+ */
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
+section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
+  color: #fff;
+}
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+:root {
+  --r-background-color: #fff;
+  --r-main-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-main-font-size: 42px;
+  --r-main-color: #000;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-heading-color: #000;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: 600;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 2.5em;
+  --r-heading2-size: 1.6em;
+  --r-heading3-size: 1.3em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #2a76dd;
+  --r-link-color-dark: rgb(30.7720647773, 99.5566801619, 192.7779352227);
+  --r-link-color-hover: rgb(73.95, 138.55, 226.1);
+  --r-selection-background-color: rgb(95.25, 152.25, 229.5);
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 0, 0, 0;
+  --r-overlay-element-fg-color: 240, 240, 240;
+}
+
+.reveal-viewport {
+  background: #fff;
+  background-color: var(--r-background-color);
+}
+
+.reveal {
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
+  font-weight: normal;
+  color: var(--r-main-color);
+}
+
+.reveal ::selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal ::-moz-selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit;
+}
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
+
+.reveal h1 {
+  font-size: var(--r-heading1-size);
+}
+
+.reveal h2 {
+  font-size: var(--r-heading2-size);
+}
+
+.reveal h3 {
+  font-size: var(--r-heading3-size);
+}
+
+.reveal h4 {
+  font-size: var(--r-heading4-size);
+}
+
+.reveal h1 {
+  text-shadow: var(--r-heading1-text-shadow);
+}
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%;
+}
+
+.reveal strong,
+.reveal b {
+  font-weight: bold;
+}
+
+.reveal em {
+  font-style: italic;
+}
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em;
+}
+
+.reveal ol {
+  list-style-type: decimal;
+}
+
+.reveal ul {
+  list-style-type: disc;
+}
+
+.reveal ul ul {
+  list-style-type: square;
+}
+
+.reveal ul ul ul {
+  list-style-type: circle;
+}
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px;
+}
+
+.reveal dt {
+  font-weight: bold;
+}
+
+.reveal dd {
+  margin-left: 40px;
+}
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: var(--r-block-margin) auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block;
+}
+
+.reveal q {
+  font-style: italic;
+}
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: var(--r-block-margin) auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: var(--r-code-font);
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
+
+.reveal code {
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+.reveal table th {
+  font-weight: bold;
+}
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid;
+}
+
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
+
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none;
+}
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller;
+}
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller;
+}
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top;
+}
+
+.reveal small * {
+  vertical-align: top;
+}
+
+.reveal img {
+  margin: var(--r-block-margin) 0;
+}
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: var(--r-link-color);
+  text-decoration: none;
+  transition: color 0.15s ease;
+}
+
+.reveal a:hover {
+  color: var(--r-link-color-hover);
+  text-shadow: none;
+  border: none;
+}
+
+.reveal .roll span:after {
+  color: #fff;
+  background: var(--r-link-color-dark);
+}
+
+/*********************************************
+ * Frame helper
+ *********************************************/
+.reveal .r-frame {
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
+
+.reveal a .r-frame {
+  transition: all 0.15s linear;
+}
+
+.reveal a:hover .r-frame {
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/white.css

@@ -3,62 +3,72 @@
  *
  * By Hakim El Hattab, http://hakim.se
  */
-@import url(fonts/source-sans-pro/source-sans-pro.css);
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
 section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
-  color: #fff; }
+  color: #fff;
+}
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 :root {
-  --background-color: #fff;
-  --main-font: Source Sans Pro, Helvetica, sans-serif;
-  --main-font-size: 42px;
-  --main-color: #222;
-  --block-margin: 20px;
-  --heading-margin: 0 0 20px 0;
-  --heading-font: Source Sans Pro, Helvetica, sans-serif;
-  --heading-color: #222;
-  --heading-line-height: 1.2;
-  --heading-letter-spacing: normal;
-  --heading-text-transform: uppercase;
-  --heading-text-shadow: none;
-  --heading-font-weight: 600;
-  --heading1-text-shadow: none;
-  --heading1-size: 2.5em;
-  --heading2-size: 1.6em;
-  --heading3-size: 1.3em;
-  --heading4-size: 1em;
-  --code-font: monospace;
-  --link-color: #2a76dd;
-  --link-color-hover: #6ca0e8;
-  --selection-background-color: #98bdef;
-  --selection-color: #fff; }
+  --r-background-color: #fff;
+  --r-main-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-main-font-size: 42px;
+  --r-main-color: #222;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-heading-color: #222;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: uppercase;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: 600;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 2.5em;
+  --r-heading2-size: 1.6em;
+  --r-heading3-size: 1.3em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #2a76dd;
+  --r-link-color-dark: rgb(30.7720647773, 99.5566801619, 192.7779352227);
+  --r-link-color-hover: rgb(73.95, 138.55, 226.1);
+  --r-selection-background-color: rgb(95.25, 152.25, 229.5);
+  --r-selection-color: #fff;
+  --r-overlay-element-bg-color: 0, 0, 0;
+  --r-overlay-element-fg-color: 240, 240, 240;
+}
 
 .reveal-viewport {
   background: #fff;
-  background-color: #fff; }
+  background-color: var(--r-background-color);
+}
 
 .reveal {
-  font-family: "Source Sans Pro", Helvetica, sans-serif;
-  font-size: 42px;
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
   font-weight: normal;
-  color: #222; }
+  color: var(--r-main-color);
+}
 
 .reveal ::selection {
-  color: #fff;
-  background: #98bdef;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal ::-moz-selection {
-  color: #fff;
-  background: #98bdef;
-  text-shadow: none; }
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
 
 .reveal .slides section,
 .reveal .slides section > section {
   line-height: 1.3;
-  font-weight: inherit; }
+  font-weight: inherit;
+}
 
 /*********************************************
  * HEADERS
@@ -69,220 +79,281 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
 .reveal h4,
 .reveal h5,
 .reveal h6 {
-  margin: 0 0 20px 0;
-  color: #222;
-  font-family: "Source Sans Pro", Helvetica, sans-serif;
-  font-weight: 600;
-  line-height: 1.2;
-  letter-spacing: normal;
-  text-transform: uppercase;
-  text-shadow: none;
-  word-wrap: break-word; }
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
 
 .reveal h1 {
-  font-size: 2.5em; }
+  font-size: var(--r-heading1-size);
+}
 
 .reveal h2 {
-  font-size: 1.6em; }
+  font-size: var(--r-heading2-size);
+}
 
 .reveal h3 {
-  font-size: 1.3em; }
+  font-size: var(--r-heading3-size);
+}
 
 .reveal h4 {
-  font-size: 1em; }
+  font-size: var(--r-heading4-size);
+}
 
 .reveal h1 {
-  text-shadow: none; }
+  text-shadow: var(--r-heading1-text-shadow);
+}
 
 /*********************************************
  * OTHER
  *********************************************/
 .reveal p {
-  margin: 20px 0;
-  line-height: 1.3; }
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
 
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
 .reveal iframe {
   max-width: 95%;
-  max-height: 95%; }
+  max-height: 95%;
+}
 
 .reveal strong,
 .reveal b {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal em {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal ol,
 .reveal dl,
 .reveal ul {
   display: inline-block;
   text-align: left;
-  margin: 0 0 0 1em; }
+  margin: 0 0 0 1em;
+}
 
 .reveal ol {
-  list-style-type: decimal; }
+  list-style-type: decimal;
+}
 
 .reveal ul {
-  list-style-type: disc; }
+  list-style-type: disc;
+}
 
 .reveal ul ul {
-  list-style-type: square; }
+  list-style-type: square;
+}
 
 .reveal ul ul ul {
-  list-style-type: circle; }
+  list-style-type: circle;
+}
 
 .reveal ul ul,
 .reveal ul ol,
 .reveal ol ol,
 .reveal ol ul {
   display: block;
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal dt {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal dd {
-  margin-left: 40px; }
+  margin-left: 40px;
+}
 
 .reveal blockquote {
   display: block;
   position: relative;
   width: 70%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   padding: 5px;
   font-style: italic;
   background: rgba(255, 255, 255, 0.05);
-  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
 
 .reveal blockquote p:first-child,
 .reveal blockquote p:last-child {
-  display: inline-block; }
+  display: inline-block;
+}
 
 .reveal q {
-  font-style: italic; }
+  font-style: italic;
+}
 
 .reveal pre {
   display: block;
   position: relative;
   width: 90%;
-  margin: 20px auto;
+  margin: var(--r-block-margin) auto;
   text-align: left;
   font-size: 0.55em;
-  font-family: monospace;
+  font-family: var(--r-code-font);
   line-height: 1.2em;
   word-wrap: break-word;
-  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
 
 .reveal code {
-  font-family: monospace;
-  text-transform: none; }
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
 
 .reveal pre code {
   display: block;
   padding: 5px;
   overflow: auto;
   max-height: 400px;
-  word-wrap: normal; }
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
 
 .reveal table {
   margin: auto;
   border-collapse: collapse;
-  border-spacing: 0; }
+  border-spacing: 0;
+}
 
 .reveal table th {
-  font-weight: bold; }
+  font-weight: bold;
+}
 
 .reveal table th,
 .reveal table td {
   text-align: left;
   padding: 0.2em 0.5em 0.2em 0.5em;
-  border-bottom: 1px solid; }
+  border-bottom: 1px solid;
+}
 
-.reveal table th[align="center"],
-.reveal table td[align="center"] {
-  text-align: center; }
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
 
-.reveal table th[align="right"],
-.reveal table td[align="right"] {
-  text-align: right; }
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
 
 .reveal table tbody tr:last-child th,
 .reveal table tbody tr:last-child td {
-  border-bottom: none; }
+  border-bottom: none;
+}
 
 .reveal sup {
   vertical-align: super;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal sub {
   vertical-align: sub;
-  font-size: smaller; }
+  font-size: smaller;
+}
 
 .reveal small {
   display: inline-block;
   font-size: 0.6em;
   line-height: 1.2em;
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal small * {
-  vertical-align: top; }
+  vertical-align: top;
+}
 
 .reveal img {
-  margin: 20px 0; }
+  margin: var(--r-block-margin) 0;
+}
 
 /*********************************************
  * LINKS
  *********************************************/
 .reveal a {
-  color: #2a76dd;
+  color: var(--r-link-color);
   text-decoration: none;
-  transition: color .15s ease; }
+  transition: color 0.15s ease;
+}
 
 .reveal a:hover {
-  color: #6ca0e8;
+  color: var(--r-link-color-hover);
   text-shadow: none;
-  border: none; }
+  border: none;
+}
 
 .reveal .roll span:after {
   color: #fff;
-  background: #1a53a1; }
+  background: var(--r-link-color-dark);
+}
 
 /*********************************************
  * Frame helper
  *********************************************/
 .reveal .r-frame {
-  border: 4px solid #222;
-  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
 
 .reveal a .r-frame {
-  transition: all .15s linear; }
+  transition: all 0.15s linear;
+}
 
 .reveal a:hover .r-frame {
-  border-color: #2a76dd;
-  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 /*********************************************
  * NAVIGATION CONTROLS
  *********************************************/
 .reveal .controls {
-  color: #2a76dd; }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PROGRESS BAR
  *********************************************/
 .reveal .progress {
   background: rgba(0, 0, 0, 0.2);
-  color: #2a76dd; }
-
-.reveal .progress span {
-  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+  color: var(--r-link-color);
+}
 
 /*********************************************
  * PRINT BACKGROUND
  *********************************************/
 @media print {
   .backgrounds {
-    background-color: #fff; } }
+    background-color: var(--r-background-color);
+  }
+}

dist/theme/white_contrast_compact_verbatim_headers.css

@@ -0,0 +1,360 @@
+/**
+ * White compact & high contrast reveal.js theme, with headers not in capitals.
+ *
+ * By Peter Kehl. Based on white.(s)css by Hakim El Hattab, http://hakim.se
+ *
+ * - Keep the source similar to black.css - for easy comparison.
+ * - $mainFontSize controls code blocks, too (although under some ratio).
+ */
+@import url(./fonts/source-sans-pro/source-sans-pro.css);
+section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
+  color: #fff;
+}
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+:root {
+  --r-background-color: #fff;
+  --r-main-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-main-font-size: 25px;
+  --r-main-color: #000;
+  --r-block-margin: 20px;
+  --r-heading-margin: 0 0 20px 0;
+  --r-heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --r-heading-color: #000;
+  --r-heading-line-height: 1.2;
+  --r-heading-letter-spacing: normal;
+  --r-heading-text-transform: none;
+  --r-heading-text-shadow: none;
+  --r-heading-font-weight: 450;
+  --r-heading1-text-shadow: none;
+  --r-heading1-size: 2.5em;
+  --r-heading2-size: 1.6em;
+  --r-heading3-size: 1.3em;
+  --r-heading4-size: 1em;
+  --r-code-font: monospace;
+  --r-link-color: #2a76dd;
+  --r-link-color-dark: #1a53a1;
+  --r-link-color-hover: #6ca0e8;
+  --r-selection-background-color: #98bdef;
+  --r-selection-color: #fff;
+}
+
+.reveal-viewport {
+  background: #fff;
+  background-color: var(--r-background-color);
+}
+
+.reveal {
+  font-family: var(--r-main-font);
+  font-size: var(--r-main-font-size);
+  font-weight: normal;
+  color: var(--r-main-color);
+}
+
+.reveal ::selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal ::-moz-selection {
+  color: var(--r-selection-color);
+  background: var(--r-selection-background-color);
+  text-shadow: none;
+}
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit;
+}
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: var(--r-heading-margin);
+  color: var(--r-heading-color);
+  font-family: var(--r-heading-font);
+  font-weight: var(--r-heading-font-weight);
+  line-height: var(--r-heading-line-height);
+  letter-spacing: var(--r-heading-letter-spacing);
+  text-transform: var(--r-heading-text-transform);
+  text-shadow: var(--r-heading-text-shadow);
+  word-wrap: break-word;
+}
+
+.reveal h1 {
+  font-size: var(--r-heading1-size);
+}
+
+.reveal h2 {
+  font-size: var(--r-heading2-size);
+}
+
+.reveal h3 {
+  font-size: var(--r-heading3-size);
+}
+
+.reveal h4 {
+  font-size: var(--r-heading4-size);
+}
+
+.reveal h1 {
+  text-shadow: var(--r-heading1-text-shadow);
+}
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: var(--r-block-margin) 0;
+  line-height: 1.3;
+}
+
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0;
+}
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%;
+}
+
+.reveal strong,
+.reveal b {
+  font-weight: bold;
+}
+
+.reveal em {
+  font-style: italic;
+}
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em;
+}
+
+.reveal ol {
+  list-style-type: decimal;
+}
+
+.reveal ul {
+  list-style-type: disc;
+}
+
+.reveal ul ul {
+  list-style-type: square;
+}
+
+.reveal ul ul ul {
+  list-style-type: circle;
+}
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px;
+}
+
+.reveal dt {
+  font-weight: bold;
+}
+
+.reveal dd {
+  margin-left: 40px;
+}
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: var(--r-block-margin) auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2);
+}
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block;
+}
+
+.reveal q {
+  font-style: italic;
+}
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: var(--r-block-margin) auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: var(--r-code-font);
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
+
+.reveal code {
+  font-family: var(--r-code-font);
+  text-transform: none;
+  tab-size: 2;
+}
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal;
+}
+
+.reveal .code-wrapper {
+  white-space: normal;
+}
+
+.reveal .code-wrapper code {
+  white-space: pre;
+}
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+.reveal table th {
+  font-weight: bold;
+}
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid;
+}
+
+.reveal table th[align=center],
+.reveal table td[align=center] {
+  text-align: center;
+}
+
+.reveal table th[align=right],
+.reveal table td[align=right] {
+  text-align: right;
+}
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none;
+}
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller;
+}
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller;
+}
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top;
+}
+
+.reveal small * {
+  vertical-align: top;
+}
+
+.reveal img {
+  margin: var(--r-block-margin) 0;
+}
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: var(--r-link-color);
+  text-decoration: none;
+  transition: color 0.15s ease;
+}
+
+.reveal a:hover {
+  color: var(--r-link-color-hover);
+  text-shadow: none;
+  border: none;
+}
+
+.reveal .roll span:after {
+  color: #fff;
+  background: var(--r-link-color-dark);
+}
+
+/*********************************************
+ * Frame helper
+ *********************************************/
+.reveal .r-frame {
+  border: 4px solid var(--r-main-color);
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
+
+.reveal a .r-frame {
+  transition: all 0.15s linear;
+}
+
+.reveal a:hover .r-frame {
+  border-color: var(--r-link-color);
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: var(--r-link-color);
+}
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: var(--r-background-color);
+  }
+}

examples/500-slides.html

@@ -0,0 +1,526 @@
+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - 500 slides</title>
+
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/black.css">
+	</head>
+
+	<body>
+		<div class="reveal">
+			<div class="slides">
+				<section><h1>1</h1></section>
+				<section><h1>2</h1></section>
+				<section><h1>3</h1></section>
+				<section><h1>4</h1></section>
+				<section><h1>5</h1></section>
+				<section><h1>6</h1></section>
+				<section><h1>7</h1></section>
+				<section><h1>8</h1></section>
+				<section><h1>9</h1></section>
+				<section><h1>10</h1></section>
+				<section><h1>11</h1></section>
+				<section><h1>12</h1></section>
+				<section><h1>13</h1></section>
+				<section><h1>14</h1></section>
+				<section><h1>15</h1></section>
+				<section><h1>16</h1></section>
+				<section><h1>17</h1></section>
+				<section><h1>18</h1></section>
+				<section><h1>19</h1></section>
+				<section><h1>20</h1></section>
+				<section><h1>21</h1></section>
+				<section><h1>22</h1></section>
+				<section><h1>23</h1></section>
+				<section><h1>24</h1></section>
+				<section><h1>25</h1></section>
+				<section><h1>26</h1></section>
+				<section><h1>27</h1></section>
+				<section><h1>28</h1></section>
+				<section><h1>29</h1></section>
+				<section><h1>30</h1></section>
+				<section><h1>31</h1></section>
+				<section><h1>32</h1></section>
+				<section><h1>33</h1></section>
+				<section><h1>34</h1></section>
+				<section><h1>35</h1></section>
+				<section><h1>36</h1></section>
+				<section><h1>37</h1></section>
+				<section><h1>38</h1></section>
+				<section><h1>39</h1></section>
+				<section><h1>40</h1></section>
+				<section><h1>41</h1></section>
+				<section><h1>42</h1></section>
+				<section><h1>43</h1></section>
+				<section><h1>44</h1></section>
+				<section><h1>45</h1></section>
+				<section><h1>46</h1></section>
+				<section><h1>47</h1></section>
+				<section><h1>48</h1></section>
+				<section><h1>49</h1></section>
+				<section><h1>50</h1></section>
+				<section><h1>51</h1></section>
+				<section><h1>52</h1></section>
+				<section><h1>53</h1></section>
+				<section><h1>54</h1></section>
+				<section><h1>55</h1></section>
+				<section><h1>56</h1></section>
+				<section><h1>57</h1></section>
+				<section><h1>58</h1></section>
+				<section><h1>59</h1></section>
+				<section><h1>60</h1></section>
+				<section><h1>61</h1></section>
+				<section><h1>62</h1></section>
+				<section><h1>63</h1></section>
+				<section><h1>64</h1></section>
+				<section><h1>65</h1></section>
+				<section><h1>66</h1></section>
+				<section><h1>67</h1></section>
+				<section><h1>68</h1></section>
+				<section><h1>69</h1></section>
+				<section><h1>70</h1></section>
+				<section><h1>71</h1></section>
+				<section><h1>72</h1></section>
+				<section><h1>73</h1></section>
+				<section><h1>74</h1></section>
+				<section><h1>75</h1></section>
+				<section><h1>76</h1></section>
+				<section><h1>77</h1></section>
+				<section><h1>78</h1></section>
+				<section><h1>79</h1></section>
+				<section><h1>80</h1></section>
+				<section><h1>81</h1></section>
+				<section><h1>82</h1></section>
+				<section><h1>83</h1></section>
+				<section><h1>84</h1></section>
+				<section><h1>85</h1></section>
+				<section><h1>86</h1></section>
+				<section><h1>87</h1></section>
+				<section><h1>88</h1></section>
+				<section><h1>89</h1></section>
+				<section><h1>90</h1></section>
+				<section><h1>91</h1></section>
+				<section><h1>92</h1></section>
+				<section><h1>93</h1></section>
+				<section><h1>94</h1></section>
+				<section><h1>95</h1></section>
+				<section><h1>96</h1></section>
+				<section><h1>97</h1></section>
+				<section><h1>98</h1></section>
+				<section><h1>99</h1></section>
+				<section><h1>100</h1></section>
+				<section><h1>101</h1></section>
+				<section><h1>102</h1></section>
+				<section><h1>103</h1></section>
+				<section><h1>104</h1></section>
+				<section><h1>105</h1></section>
+				<section><h1>106</h1></section>
+				<section><h1>107</h1></section>
+				<section><h1>108</h1></section>
+				<section><h1>109</h1></section>
+				<section><h1>110</h1></section>
+				<section><h1>111</h1></section>
+				<section><h1>112</h1></section>
+				<section><h1>113</h1></section>
+				<section><h1>114</h1></section>
+				<section><h1>115</h1></section>
+				<section><h1>116</h1></section>
+				<section><h1>117</h1></section>
+				<section><h1>118</h1></section>
+				<section><h1>119</h1></section>
+				<section><h1>120</h1></section>
+				<section><h1>121</h1></section>
+				<section><h1>122</h1></section>
+				<section><h1>123</h1></section>
+				<section><h1>124</h1></section>
+				<section><h1>125</h1></section>
+				<section><h1>126</h1></section>
+				<section><h1>127</h1></section>
+				<section><h1>128</h1></section>
+				<section><h1>129</h1></section>
+				<section><h1>130</h1></section>
+				<section><h1>131</h1></section>
+				<section><h1>132</h1></section>
+				<section><h1>133</h1></section>
+				<section><h1>134</h1></section>
+				<section><h1>135</h1></section>
+				<section><h1>136</h1></section>
+				<section><h1>137</h1></section>
+				<section><h1>138</h1></section>
+				<section><h1>139</h1></section>
+				<section><h1>140</h1></section>
+				<section><h1>141</h1></section>
+				<section><h1>142</h1></section>
+				<section><h1>143</h1></section>
+				<section><h1>144</h1></section>
+				<section><h1>145</h1></section>
+				<section><h1>146</h1></section>
+				<section><h1>147</h1></section>
+				<section><h1>148</h1></section>
+				<section><h1>149</h1></section>
+				<section><h1>150</h1></section>
+				<section><h1>151</h1></section>
+				<section><h1>152</h1></section>
+				<section><h1>153</h1></section>
+				<section><h1>154</h1></section>
+				<section><h1>155</h1></section>
+				<section><h1>156</h1></section>
+				<section><h1>157</h1></section>
+				<section><h1>158</h1></section>
+				<section><h1>159</h1></section>
+				<section><h1>160</h1></section>
+				<section><h1>161</h1></section>
+				<section><h1>162</h1></section>
+				<section><h1>163</h1></section>
+				<section><h1>164</h1></section>
+				<section><h1>165</h1></section>
+				<section><h1>166</h1></section>
+				<section><h1>167</h1></section>
+				<section><h1>168</h1></section>
+				<section><h1>169</h1></section>
+				<section><h1>170</h1></section>
+				<section><h1>171</h1></section>
+				<section><h1>172</h1></section>
+				<section><h1>173</h1></section>
+				<section><h1>174</h1></section>
+				<section><h1>175</h1></section>
+				<section><h1>176</h1></section>
+				<section><h1>177</h1></section>
+				<section><h1>178</h1></section>
+				<section><h1>179</h1></section>
+				<section><h1>180</h1></section>
+				<section><h1>181</h1></section>
+				<section><h1>182</h1></section>
+				<section><h1>183</h1></section>
+				<section><h1>184</h1></section>
+				<section><h1>185</h1></section>
+				<section><h1>186</h1></section>
+				<section><h1>187</h1></section>
+				<section><h1>188</h1></section>
+				<section><h1>189</h1></section>
+				<section><h1>190</h1></section>
+				<section><h1>191</h1></section>
+				<section><h1>192</h1></section>
+				<section><h1>193</h1></section>
+				<section><h1>194</h1></section>
+				<section><h1>195</h1></section>
+				<section><h1>196</h1></section>
+				<section><h1>197</h1></section>
+				<section><h1>198</h1></section>
+				<section><h1>199</h1></section>
+				<section><h1>200</h1></section>
+				<section><h1>201</h1></section>
+				<section><h1>202</h1></section>
+				<section><h1>203</h1></section>
+				<section><h1>204</h1></section>
+				<section><h1>205</h1></section>
+				<section><h1>206</h1></section>
+				<section><h1>207</h1></section>
+				<section><h1>208</h1></section>
+				<section><h1>209</h1></section>
+				<section><h1>210</h1></section>
+				<section><h1>211</h1></section>
+				<section><h1>212</h1></section>
+				<section><h1>213</h1></section>
+				<section><h1>214</h1></section>
+				<section><h1>215</h1></section>
+				<section><h1>216</h1></section>
+				<section><h1>217</h1></section>
+				<section><h1>218</h1></section>
+				<section><h1>219</h1></section>
+				<section><h1>220</h1></section>
+				<section><h1>221</h1></section>
+				<section><h1>222</h1></section>
+				<section><h1>223</h1></section>
+				<section><h1>224</h1></section>
+				<section><h1>225</h1></section>
+				<section><h1>226</h1></section>
+				<section><h1>227</h1></section>
+				<section><h1>228</h1></section>
+				<section><h1>229</h1></section>
+				<section><h1>230</h1></section>
+				<section><h1>231</h1></section>
+				<section><h1>232</h1></section>
+				<section><h1>233</h1></section>
+				<section><h1>234</h1></section>
+				<section><h1>235</h1></section>
+				<section><h1>236</h1></section>
+				<section><h1>237</h1></section>
+				<section><h1>238</h1></section>
+				<section><h1>239</h1></section>
+				<section><h1>240</h1></section>
+				<section><h1>241</h1></section>
+				<section><h1>242</h1></section>
+				<section><h1>243</h1></section>
+				<section><h1>244</h1></section>
+				<section><h1>245</h1></section>
+				<section><h1>246</h1></section>
+				<section><h1>247</h1></section>
+				<section><h1>248</h1></section>
+				<section><h1>249</h1></section>
+				<section><h1>250</h1></section>
+				<section><h1>251</h1></section>
+				<section><h1>252</h1></section>
+				<section><h1>253</h1></section>
+				<section><h1>254</h1></section>
+				<section><h1>255</h1></section>
+				<section><h1>256</h1></section>
+				<section><h1>257</h1></section>
+				<section><h1>258</h1></section>
+				<section><h1>259</h1></section>
+				<section><h1>260</h1></section>
+				<section><h1>261</h1></section>
+				<section><h1>262</h1></section>
+				<section><h1>263</h1></section>
+				<section><h1>264</h1></section>
+				<section><h1>265</h1></section>
+				<section><h1>266</h1></section>
+				<section><h1>267</h1></section>
+				<section><h1>268</h1></section>
+				<section><h1>269</h1></section>
+				<section><h1>270</h1></section>
+				<section><h1>271</h1></section>
+				<section><h1>272</h1></section>
+				<section><h1>273</h1></section>
+				<section><h1>274</h1></section>
+				<section><h1>275</h1></section>
+				<section><h1>276</h1></section>
+				<section><h1>277</h1></section>
+				<section><h1>278</h1></section>
+				<section><h1>279</h1></section>
+				<section><h1>280</h1></section>
+				<section><h1>281</h1></section>
+				<section><h1>282</h1></section>
+				<section><h1>283</h1></section>
+				<section><h1>284</h1></section>
+				<section><h1>285</h1></section>
+				<section><h1>286</h1></section>
+				<section><h1>287</h1></section>
+				<section><h1>288</h1></section>
+				<section><h1>289</h1></section>
+				<section><h1>290</h1></section>
+				<section><h1>291</h1></section>
+				<section><h1>292</h1></section>
+				<section><h1>293</h1></section>
+				<section><h1>294</h1></section>
+				<section><h1>295</h1></section>
+				<section><h1>296</h1></section>
+				<section><h1>297</h1></section>
+				<section><h1>298</h1></section>
+				<section><h1>299</h1></section>
+				<section><h1>300</h1></section>
+				<section><h1>301</h1></section>
+				<section><h1>302</h1></section>
+				<section><h1>303</h1></section>
+				<section><h1>304</h1></section>
+				<section><h1>305</h1></section>
+				<section><h1>306</h1></section>
+				<section><h1>307</h1></section>
+				<section><h1>308</h1></section>
+				<section><h1>309</h1></section>
+				<section><h1>310</h1></section>
+				<section><h1>311</h1></section>
+				<section><h1>312</h1></section>
+				<section><h1>313</h1></section>
+				<section><h1>314</h1></section>
+				<section><h1>315</h1></section>
+				<section><h1>316</h1></section>
+				<section><h1>317</h1></section>
+				<section><h1>318</h1></section>
+				<section><h1>319</h1></section>
+				<section><h1>320</h1></section>
+				<section><h1>321</h1></section>
+				<section><h1>322</h1></section>
+				<section><h1>323</h1></section>
+				<section><h1>324</h1></section>
+				<section><h1>325</h1></section>
+				<section><h1>326</h1></section>
+				<section><h1>327</h1></section>
+				<section><h1>328</h1></section>
+				<section><h1>329</h1></section>
+				<section><h1>330</h1></section>
+				<section><h1>331</h1></section>
+				<section><h1>332</h1></section>
+				<section><h1>333</h1></section>
+				<section><h1>334</h1></section>
+				<section><h1>335</h1></section>
+				<section><h1>336</h1></section>
+				<section><h1>337</h1></section>
+				<section><h1>338</h1></section>
+				<section><h1>339</h1></section>
+				<section><h1>340</h1></section>
+				<section><h1>341</h1></section>
+				<section><h1>342</h1></section>
+				<section><h1>343</h1></section>
+				<section><h1>344</h1></section>
+				<section><h1>345</h1></section>
+				<section><h1>346</h1></section>
+				<section><h1>347</h1></section>
+				<section><h1>348</h1></section>
+				<section><h1>349</h1></section>
+				<section><h1>350</h1></section>
+				<section><h1>351</h1></section>
+				<section><h1>352</h1></section>
+				<section><h1>353</h1></section>
+				<section><h1>354</h1></section>
+				<section><h1>355</h1></section>
+				<section><h1>356</h1></section>
+				<section><h1>357</h1></section>
+				<section><h1>358</h1></section>
+				<section><h1>359</h1></section>
+				<section><h1>360</h1></section>
+				<section><h1>361</h1></section>
+				<section><h1>362</h1></section>
+				<section><h1>363</h1></section>
+				<section><h1>364</h1></section>
+				<section><h1>365</h1></section>
+				<section><h1>366</h1></section>
+				<section><h1>367</h1></section>
+				<section><h1>368</h1></section>
+				<section><h1>369</h1></section>
+				<section><h1>370</h1></section>
+				<section><h1>371</h1></section>
+				<section><h1>372</h1></section>
+				<section><h1>373</h1></section>
+				<section><h1>374</h1></section>
+				<section><h1>375</h1></section>
+				<section><h1>376</h1></section>
+				<section><h1>377</h1></section>
+				<section><h1>378</h1></section>
+				<section><h1>379</h1></section>
+				<section><h1>380</h1></section>
+				<section><h1>381</h1></section>
+				<section><h1>382</h1></section>
+				<section><h1>383</h1></section>
+				<section><h1>384</h1></section>
+				<section><h1>385</h1></section>
+				<section><h1>386</h1></section>
+				<section><h1>387</h1></section>
+				<section><h1>388</h1></section>
+				<section><h1>389</h1></section>
+				<section><h1>390</h1></section>
+				<section><h1>391</h1></section>
+				<section><h1>392</h1></section>
+				<section><h1>393</h1></section>
+				<section><h1>394</h1></section>
+				<section><h1>395</h1></section>
+				<section><h1>396</h1></section>
+				<section><h1>397</h1></section>
+				<section><h1>398</h1></section>
+				<section><h1>399</h1></section>
+				<section><h1>400</h1></section>
+				<section><h1>401</h1></section>
+				<section><h1>402</h1></section>
+				<section><h1>403</h1></section>
+				<section><h1>404</h1></section>
+				<section><h1>405</h1></section>
+				<section><h1>406</h1></section>
+				<section><h1>407</h1></section>
+				<section><h1>408</h1></section>
+				<section><h1>409</h1></section>
+				<section><h1>410</h1></section>
+				<section><h1>411</h1></section>
+				<section><h1>412</h1></section>
+				<section><h1>413</h1></section>
+				<section><h1>414</h1></section>
+				<section><h1>415</h1></section>
+				<section><h1>416</h1></section>
+				<section><h1>417</h1></section>
+				<section><h1>418</h1></section>
+				<section><h1>419</h1></section>
+				<section><h1>420</h1></section>
+				<section><h1>421</h1></section>
+				<section><h1>422</h1></section>
+				<section><h1>423</h1></section>
+				<section><h1>424</h1></section>
+				<section><h1>425</h1></section>
+				<section><h1>426</h1></section>
+				<section><h1>427</h1></section>
+				<section><h1>428</h1></section>
+				<section><h1>429</h1></section>
+				<section><h1>430</h1></section>
+				<section><h1>431</h1></section>
+				<section><h1>432</h1></section>
+				<section><h1>433</h1></section>
+				<section><h1>434</h1></section>
+				<section><h1>435</h1></section>
+				<section><h1>436</h1></section>
+				<section><h1>437</h1></section>
+				<section><h1>438</h1></section>
+				<section><h1>439</h1></section>
+				<section><h1>440</h1></section>
+				<section><h1>441</h1></section>
+				<section><h1>442</h1></section>
+				<section><h1>443</h1></section>
+				<section><h1>444</h1></section>
+				<section><h1>445</h1></section>
+				<section><h1>446</h1></section>
+				<section><h1>447</h1></section>
+				<section><h1>448</h1></section>
+				<section><h1>449</h1></section>
+				<section><h1>450</h1></section>
+				<section><h1>451</h1></section>
+				<section><h1>452</h1></section>
+				<section><h1>453</h1></section>
+				<section><h1>454</h1></section>
+				<section><h1>455</h1></section>
+				<section><h1>456</h1></section>
+				<section><h1>457</h1></section>
+				<section><h1>458</h1></section>
+				<section><h1>459</h1></section>
+				<section><h1>460</h1></section>
+				<section><h1>461</h1></section>
+				<section><h1>462</h1></section>
+				<section><h1>463</h1></section>
+				<section><h1>464</h1></section>
+				<section><h1>465</h1></section>
+				<section><h1>466</h1></section>
+				<section><h1>467</h1></section>
+				<section><h1>468</h1></section>
+				<section><h1>469</h1></section>
+				<section><h1>470</h1></section>
+				<section><h1>471</h1></section>
+				<section><h1>472</h1></section>
+				<section><h1>473</h1></section>
+				<section><h1>474</h1></section>
+				<section><h1>475</h1></section>
+				<section><h1>476</h1></section>
+				<section><h1>477</h1></section>
+				<section><h1>478</h1></section>
+				<section><h1>479</h1></section>
+				<section><h1>480</h1></section>
+				<section><h1>481</h1></section>
+				<section><h1>482</h1></section>
+				<section><h1>483</h1></section>
+				<section><h1>484</h1></section>
+				<section><h1>485</h1></section>
+				<section><h1>486</h1></section>
+				<section><h1>487</h1></section>
+				<section><h1>488</h1></section>
+				<section><h1>489</h1></section>
+				<section><h1>490</h1></section>
+				<section><h1>491</h1></section>
+				<section><h1>492</h1></section>
+				<section><h1>493</h1></section>
+				<section><h1>494</h1></section>
+				<section><h1>495</h1></section>
+				<section><h1>496</h1></section>
+				<section><h1>497</h1></section>
+				<section><h1>498</h1></section>
+				<section><h1>499</h1></section>
+			</div>
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script>
+			Reveal.initialize({
+				transition: 'linear'
+			});
+		</script>
+	</body>
+</html>

examples/auto-animate.html

@@ -18,7 +18,6 @@
 		<div class="reveal">
 
 			<div class="slides">
-
 				<section data-auto-animate data-auto-animate-unmatched="fade">
 					<h3>Auto-Animate Example</h3>
 					<p>This will fade out</p>
@@ -126,7 +125,7 @@
 				</section>
 
 				<section data-auto-animate style="height: 600px">
-					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 1</h2>
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 1</h3>
 					<h2 data-id="title" style="margin-top: 260px;">Animate Anything</h2>
 					<div data-id="1" style="background: white; position: absolute; top: 150px; left: 16%; width: 60px; height: 60px;"></div>
 					<div data-id="2" style="background: white; position: absolute; top: 150px; left: 36%; width: 60px; height: 60px;"></div>
@@ -134,7 +133,7 @@
 					<div data-id="4" style="background: white; position: absolute; top: 150px; left: 76%; width: 60px; height: 60px;"></div>
 				</section>
 				<section data-auto-animate style="height: 600px">
-					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 2</h2>
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 2</h3>
 					<h2 data-id="title" style="margin-top: 500px">With Auto Animate</h2>
 					<div data-id="1" style="background: cyan; position: absolute; bottom: 190px; left: 16%; width: 60px; height: 60px;"></div>
 					<div data-id="2" style="background: magenta; position: absolute; bottom: 190px; left: 36%; width: 60px; height: 160px;"></div>
@@ -142,7 +141,7 @@
 					<div data-id="4" style="background: red; position: absolute; bottom: 190px; left: 76%; width: 60px; height: 360px;"></div>
 				</section>
 				<section data-auto-animate style="height: 600px">
-					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 3</h2>
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 3</h3>
 					<h2 data-id="title" style="margin-top: 500px; opacity: 0;">With Auto Animate</h2>
 					<div data-id="1" style="background: cyan; position: absolute; top: 50%; left: 50%; width: 400px; height: 400px; margin: -200px 0 0 -200px; border-radius: 400px;"></div>
 					<div data-id="2" style="background: magenta; position: absolute; top: 50%; left: 50%; width: 300px; height: 300px; margin: -150px 0 0 -150px; border-radius: 400px;"></div>
@@ -150,7 +149,7 @@
 					<div data-id="4" style="background: red; position: absolute; top: 50%; left: 50%; width: 100px; height: 100px; margin: -50px 0 0 -50px; border-radius: 400px;"></div>
 				</section>
 				<section data-auto-animate style="height: 600px">
-					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 3</h2>
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 3</h3>
 					<h2 data-id="title" style="margin-top: 500px; opacity: 0;">With Auto Animate</h2>
 					<div data-id="1" style="background: red; position: absolute; top: 250px; left: 16%; width: 60px; height: 60px;"></div>
 					<div data-id="2" style="background: yellow; position: absolute; top: 250px; left: 36%; width: 60px; height: 60px;"></div>
@@ -158,6 +157,56 @@
 					<div data-id="4" style="background: cyan; position: absolute; top: 250px; left: 76%; width: 60px; height: 60px;"></div>
 				</section>
 
+				<section data-auto-animate data-auto-animate-id="a">
+					<h2>data-auto-animate-id="a"</h2>
+					<h3>A1</h3>
+				</section>
+				<section data-auto-animate data-auto-animate-id="a">
+					<h2>data-auto-animate-id="a"</h2>
+					<h3>A1</h3>
+					<h3>A2</h3>
+				</section>
+				<section data-auto-animate data-auto-animate-id="b">
+					<h2>data-auto-animate-id="b"</h2>
+					<h3>B1</h3>
+				</section>
+				<section data-auto-animate data-auto-animate-id="b">
+					<h2>data-auto-animate-id="b"</h2>
+					<h3>B1</h3>
+					<h3>B2</h3>
+				</section>
+
+				<section>
+					<section id="stacked-slide-1" data-auto-animate>
+						<a href="#/stacked-slide-1">Slide 1</a><br>
+						<a href="#/stacked-slide-2">Slide 2</a><br>
+						<a href="#/stacked-slide-3">Slide 3</a><br>
+						<a href="#/stacked-slide-4">Slide 4</a><br>
+						<div data-id="anim" style="background: indigo; padding: 8px; width: 50px; height: 50px; position: absolute; left: 0px;">A</div>
+					</section>
+					<section id="stacked-slide-2" data-auto-animate>
+						<a href="#/stacked-slide-1">Slide 1</a><br>
+						<a href="#/stacked-slide-2">Slide 2</a><br>
+						<a href="#/stacked-slide-3">Slide 3</a><br>
+						<a href="#/stacked-slide-4">Slide 4</a><br>
+						<div data-id="anim" style="background: indigo; padding: 8px; width: 50px; height: 50px; position: absolute; left: 25%;">A</div>
+					</section>
+					<section id="stacked-slide-3" data-auto-animate>
+						<a href="#/stacked-slide-1">Slide 1</a><br>
+						<a href="#/stacked-slide-2">Slide 2</a><br>
+						<a href="#/stacked-slide-3">Slide 3</a><br>
+						<a href="#/stacked-slide-4">Slide 4</a><br>
+						<div data-id="anim" style="background: indigo; padding: 8px; width: 50px; height: 50px; position: absolute; left: 50%;">A</div>
+					</section>
+					<section id="stacked-slide-4" data-auto-animate>
+						<a href="#/stacked-slide-1">Slide 1</a><br>
+						<a href="#/stacked-slide-2">Slide 2</a><br>
+						<a href="#/stacked-slide-3">Slide 3</a><br>
+						<a href="#/stacked-slide-4">Slide 4</a><br>
+						<div data-id="anim" style="background: indigo; padding: 8px; width: 50px; height: 50px; position: absolute; left: 75%;">A</div>
+					</section>
+				</section>
+
 			</div>
 
 		</div>

examples/backgrounds.html

@@ -126,7 +126,7 @@
 		<script>
 
 			// Full list of configuration options:
-			// https://revealjs.netlify.app/config/
+			// https://revealjs.revealjs.com/config/
 			Reveal.initialize({
 				center: true,
 

examples/layout-helpers.html

@@ -22,11 +22,31 @@
 				<section>
 					<h2>Layout Helper Examples</h2>
 					<ul>
+						<li><a href="#/fit-text">Big Text</a></li>
 						<li><a href="#/stretch">Stretch</a></li>
 						<li><a href="#/stack">Stack</a></li>
+						<li><a href="#/hstack">HStack</a></li>
+						<li><a href="#/vstack">VStack</a></li>
 					</ul>
 				</section>
 
+				<section id="fit-text">
+					<h2>Fit Text</h2>
+					<p>Resizes text to be as large as possible within its container.</p>
+					<pre><code class="html" data-trim data-line-numbers>
+					  <h2 class="r-fit-text">FIT</h2>
+					</code></pre>
+				</section>
+
+				<section>
+					<h2 class="r-fit-text">FIT</h2>
+				</section>
+
+				<section>
+					<h2 class="r-fit-text">HELLO WORLD</h2>
+					<h2 class="r-fit-text">BOTH THESE TITLES USE FIT-TEXT</h2>
+				</section>
+
 				<section id="stretch">
 					<h2>Stretch</h2>
 					<p>Makes an element as tall as possible while remaining within the slide bounds.</p>
@@ -57,6 +77,12 @@
 
 				<section>
 					<h2>Stack Example</h2>
+					<div class="r-stack">
+						<p class="fragment fade-in-then-out">One</p>
+						<p class="fragment fade-in-then-out">Two</p>
+						<p class="fragment fade-in-then-out">Three</p>
+						<p class="fragment fade-in-then-out">Four</p>
+					</div>
 					<div class="r-stack">
 						<img src="https://placekitten.com/450/300" width="450" height="300" class="fragment">
 						<img src="https://placekitten.com/300/450" width="300" height="450" class="fragment">
@@ -66,11 +92,53 @@
 
 				<section>
 					<h2>Stack Example</h2>
-					<p>One at a time.</p>
+					<p>fade-in-then-out fragments</p>
 					<div class="r-stack">
-						<img src="https://placekitten.com/450/300" width="450" height="300" class="fragment fade-out" data-fragment-index="0">
-						<img src="https://placekitten.com/300/450" width="300" height="450" class="fragment current-visible" data-fragment-index="0">
-						<img src="https://placekitten.com/400/400" width="400" height="400" class="fragment">
+						<img src="https://placekitten.com/450/300" width="450" height="300" class="fragment fade-in-then-out">
+						<img src="https://placekitten.com/300/450" width="300" height="450" class="fragment fade-in-then-out">
+						<img src="https://placekitten.com/400/400" width="400" height="400" class="fragment fade-in-then-out">
+					</div>
+				</section>
+
+				<section id="hstack">
+					<h2>HStack</h2>
+					<p>Stacks multiple elements horizontally.</p>
+					<pre><code class="html" data-trim data-line-numbers>
+					  <div class="r-hstack">
+					    &lt;img width="450" height="300" src="..."&gt;
+					    &lt;img width="300" height="450" src="..."&gt;
+					    &lt;img width="400" height="400" src="..."&gt;
+					  </div>
+					</code></pre>
+				</section>
+
+				<section data-auto-animate>
+					<h2>HStack Example</h2>
+					<div class="r-hstack">
+						<p style="padding: 0.50em; background: #eee; margin: 0.25em">One</p>
+						<p style="padding: 0.75em; background: #eee; margin: 0.25em">Two</p>
+						<p style="padding: 1.00em; background: #eee; margin: 0.25em">Three</p>
+					</div>
+				</section>
+
+				<section id="vstack">
+					<h2>VStack</h2>
+					<p>Stacks multiple elements vertically.</p>
+					<pre><code class="html" data-trim data-line-numbers>
+					  <div class="r-vstack">
+					    &lt;img width="450" height="300" src="..."&gt;
+					    &lt;img width="300" height="450" src="..."&gt;
+					    &lt;img width="400" height="400" src="..."&gt;
+					  </div>
+					</code></pre>
+				</section>
+
+				<section data-auto-animate>
+					<h2>VStack Example</h2>
+					<div class="r-vstack">
+						<p style="padding: 0.50em; background: #eee; margin: 0.25em">One</p>
+						<p style="padding: 0.75em; background: #eee; margin: 0.25em">Two</p>
+						<p style="padding: 1.00em; background: #eee; margin: 0.25em">Three</p>
 					</div>
 				</section>
 

examples/markdown.html

@@ -21,8 +21,8 @@
                 <!-- Use external markdown resource, separate slides by three newlines; vertical slides by two newlines -->
                 <section data-markdown="markdown.md" data-separator="^\n\n\n" data-separator-vertical="^\n\n"></section>
 
-                <!-- Slides are separated by three dashes (quick 'n dirty regular expression) -->
-                <section data-markdown data-separator="---">
+                <!-- Slides are separated by three dashes (the default) -->
+                <section data-markdown>
                     <script type="text/template">
                         ## Demo 1
                         Slide 1
@@ -35,7 +35,7 @@
                     </script>
                 </section>
 
-                <!-- Slides are separated by newline + three dashes + newline, vertical slides identical but two dashes -->
+                <!-- Slides are separated by regexp matching newline + three dashes + newline, vertical slides identical but two dashes -->
                 <section data-markdown data-separator="^\n---\n$" data-separator-vertical="^\n--\n$">
                     <script type="text/template">
                         ## Demo 2
@@ -53,8 +53,8 @@
                     </script>
                 </section>
 
-                <!-- No "extra" slides, since there are no separators defined (so they'll become horizontal rulers) -->
-                <section data-markdown>
+                <!-- No "extra" slides, since the separator can't be matched ("---" will become horizontal rulers) -->
+                <section data-markdown data-separator="$x">
                     <script type="text/template">
                         A
 
@@ -99,6 +99,25 @@
                     </script>
                 </section>
 
+                <!-- add optional line count offset, in this case 287 -->
+                <section data-markdown>
+                    <script type="text/template">
+                        ## echo.c
+
+                        ```c [287: 2|4,6]
+                        /* All of the options in this arg are valid, so handle them. */
+                        p = arg + 1;
+                        do {
+                            if (*p == 'n')
+                                nflag = 0;
+                            if (*p == 'e')
+                                eflag = '\\';
+                        } while (*++p); 
+                        ```
+                        [source](https://git.busybox.net/busybox/tree/coreutils/echo.c?h=1_36_stable#n287)
+                    </script>
+                </section>
+
                 <!-- Images -->
                 <section data-markdown>
                     <script type="text/template">
@@ -106,6 +125,16 @@
                     </script>
                 </section>
 
+                <!-- Math -->
+                <section data-markdown>
+					## The Lorenz Equations
+					`\[\begin{aligned}
+					\dot{x} &amp; = \sigma(y-x) \\
+					\dot{y} &amp; = \rho x - y - xz \\
+					\dot{z} &amp; = -\beta z + xy
+					\end{aligned} \]`
+                </section>
+
             </div>
 		</div>
 
@@ -113,6 +142,7 @@
         <script src="../plugin/markdown/markdown.js"></script>
         <script src="../plugin/highlight/highlight.js"></script>
         <script src="../plugin/notes/notes.js"></script>
+        <script src="../plugin/math/math.js"></script>
 
 		<script>
 
@@ -122,7 +152,7 @@
 				history: true,
 				center: true,
 
-				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes ]
+				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes, RevealMath.KaTeX ]
 			});
 
 		</script>

examples/markdown.md

@@ -31,6 +31,11 @@ Content 3.1
 Content 3.2
 
 
-## External 3.3
+## External 3.3 (Image)
 
 ![External Image](https://s3.amazonaws.com/static.slid.es/logo/v2/slides-symbol-512x512.png)
+
+
+## External 3.4 (Math)
+
+`\[ J(\theta_0,\theta_1) = \sum_{i=0} \]`

examples/math.html

@@ -20,7 +20,7 @@
 
 				<section>
 					<h2>reveal.js Math Plugin</h2>
-					<p>A thin wrapper for MathJax</p>
+					<p>Render math with KaTeX, MathJax 2 or MathJax 3</p>
 				</section>
 
 				<section>
@@ -176,13 +176,13 @@
 		</div>
 
 		<script src="../dist/reveal.js"></script>
+		<script src="../plugin/math/math.js"></script>
 		<script>
 			Reveal.initialize({
 				history: true,
 				transition: 'linear',
 
-				math: {
-					// mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js',
+				mathjax2: {
 					config: 'TeX-AMS_HTML-full',
 					TeX: {
 						Macros: {
@@ -192,9 +192,13 @@
 					}
 				},
 
-				dependencies: [
-					{ src: '../plugin/math/math.js', async: true }
-				]
+				// There are three typesetters available
+				// RevealMath.MathJax2 (default)
+				// RevealMath.MathJax3
+				// RevealMath.KaTeX
+				//
+				// More info at https://revealjs.com/math/
+				plugins: [ RevealMath.MathJax2 ]
 			});
 		</script>
 

examples/media.html

@@ -31,11 +31,32 @@
 					<h2 style="color: #fff;">Iframe Background</h2>
 				</section>
 
+				<section>
+					<h2>Video</h2>
+					<video src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4" data-autoplay></video>
+				</section>
+
+				<section data-background-video="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4">
+					<h2>Background Video</h2>
+				</section>
+
 				<section>
 					<h2>Auto-playing audio</h2>
 					<audio src="assets/beeping.wav" data-autoplay></audio>
 				</section>
 
+				<section>
+					<h2>Audio inside slide fragments</h2>
+					<div class="fragment">
+						Beep 1
+						<audio src="assets/beeping.wav" data-autoplay></audio>
+					</div>
+					<div class="fragment">
+						Beep 2
+						<audio src="assets/beeping.wav" data-autoplay></audio>
+					</div>
+				</section>
+
 				<section>
 					<h2>Audio with controls</h2>
 					<audio src="assets/beeping.wav" controls></audio>
@@ -47,9 +68,7 @@
 
 		<script src="../dist/reveal.js"></script>
 		<script>
-			Reveal.initialize({
-				transition: 'linear'
-			});
+			Reveal.initialize({hash: true});
 		</script>
 
 	</body>

examples/preview-overlays.html

@@ -0,0 +1,144 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Ligthbox</title>
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/black.css" id="theme">
+
+		<style>
+			.reveal {
+				font-size: 24px;
+			}
+			.reveal figure {
+				margin: 0 0 1rem 0;
+				text-align: left;
+			}
+			.reveal figure img,
+			.reveal figure video {
+				margin: 0.25rem 0 0 0;
+			}
+			figcaption, a {
+				font-size: 16px;
+			}
+		</style>
+	</head>
+
+	<body>
+
+		<div class="reveal">
+
+			<div class="slides">
+
+				<section>
+
+					<h2>Preview Overlays</h2>
+
+					<div class="r-hstack items-start">
+						<div class="r-vstack items-start">
+							<h5>Images</h5>
+							<figure>
+								<figcaption>Preview with default settings:</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/a.png" data-preview-image>
+							</figure>
+							<figure>
+								<figcaption>Preview with data-preview-fit="contain"</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/a.png" data-preview-image data-preview-fit="contain">
+							</figure>
+							<figure>
+								<figcaption>Preview with data-preview-fit="cover"</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/a.png" data-preview-image data-preview-fit="cover">
+							</figure>
+							<figure>
+								<figcaption>Preview another image (c)</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/b.png" data-preview-image="https://static.slid.es/images/alphabet/v1/c.png">
+							</figure>
+							<a href="#" data-preview-image="https://static.slid.es/images/alphabet/v1/x.png">
+								Preview image from a link.
+							</a>
+						</div>
+
+						<div style="width: 1px; height: 30vh; margin: 0 3rem;background-color: #999;"></div>
+
+						<div class="r-vstack items-start">
+							<h5>Videos</h5>
+							<figure>
+								<figcaption>Preview video</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/x.png" data-preview-video="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4">
+							</figure>
+							<figure>
+								<figcaption>Preview video</figcaption>
+								<video height="50" src="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4" data-preview-video></video>
+							</figure>
+							<a href="#" data-preview-video="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4">
+								Preview video from a link.
+							</a>
+						</div>
+
+						<div style="width: 1px; height: 30vh; margin: 0 3rem;background-color: #999;"></div>
+
+						<div class="r-vstack items-start">
+							<h5>Iframes</h5>
+							<a href="https://hakim.se">https://hakim.se | data-preview-link</a>
+							<a data-preview-link href="https://hakim.se">https://hakim.se | data-preview-link</a>
+							<br />
+							<a data-preview-link="false" href="https://hakim.se">https://hakim.se | data-preview-link=false</a>
+							<br />
+							<figure>
+								<figcaption>Preview link from an image</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/a.png" data-preview-link="https://hakim.se">
+							</figure>
+						</div>
+					</div>
+
+				</section>
+
+				<section style="text-align: left;">
+
+					<h2>Lightbox</h2>
+
+					<div class="r-hstack items-start justify-start">
+						<div class="r-vstack items-start">
+							<h5>Images</h5>
+							<figure>
+								<img height="100" src="https://static.slid.es/images/alphabet/v1/a.png" data-preview-image data-preview-fit="contain">
+							</figure>
+						</div>
+
+						<div style="width: 1px; height: 20vh; margin: 0 3rem;background-color: #222;"></div>
+
+						<div class="r-vstack items-start">
+							<h5>Videos</h5>
+							<figure>
+								<video height="100" src="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4" data-preview-video></video>
+							</figure>
+						</div>
+
+						<div style="width: 1px; height: 20vh; margin: 0 3rem;background-color: #222;"></div>
+
+						<div class="r-vstack items-start">
+							<h5>Iframes</h5>
+							<a style="font-size: 28px;" data-preview-link href="https://hakim.se">https://hakim.se</a>
+						</div>
+					</div>
+
+				</section>
+
+			</div>
+
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script>
+			Reveal.initialize({
+				previewLinks: false,
+				width: 1280,
+				height: 720
+			});
+		</script>
+
+	</body>
+</html>

examples/scroll.html

@@ -0,0 +1,120 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Scroll View</title>
+
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+
+		<link rel="stylesheet" href="../dist/reset.css">
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/black.css" id="theme">
+    <link rel="stylesheet" href="../plugin/highlight/monokai.css">
+	</head>
+
+	<body>
+
+		<div class="reveal">
+
+			<div class="slides">
+
+				<section><h1>Scroll View</h1></section>
+				<section data-background="indigo">
+					<h2>Scroll triggered fragments</h2>
+					<ul>
+						<li class="fragment fade-left">Step one</li>
+						<li class="fragment fade-left">Step two</li>
+						<li class="fragment fade-left">Step three</li>
+					</ul>
+				</section>
+				<section data-background-color="#fff"><h2>Scrollbar inverts<br>based on slide bg</h2></section>
+				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
+					<h2>Auto-Animate</h2>
+					<p>Scroll triggered auto-animations 😍</p>
+					<div class="r-hstack justify-center">
+						<div data-id="box1" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
+						<div data-id="box2" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
+						<div data-id="box3" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
+					</div>
+				</section>
+				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
+					<div class="r-hstack justify-center">
+						<div data-id="box1" data-auto-animate-delay="0" style="background: cyan; width: 150px; height: 100px; margin: 10px;"></div>
+						<div data-id="box2" data-auto-animate-delay="0.1" style="background: magenta; width: 150px; height: 100px; margin: 10px;"></div>
+						<div data-id="box3" data-auto-animate-delay="0.2" style="background: yellow; width: 150px; height: 100px; margin: 10px;"></div>
+					</div>
+					<h2 style="margin-top: 20px;">Auto-Animate</h2>
+				</section>
+				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
+					<div class="r-stack">
+						<div data-id="box1" style="background: cyan; width: 300px; height: 300px; border-radius: 200px;"></div>
+						<div data-id="box2" style="background: magenta; width: 200px; height: 200px; border-radius: 200px;"></div>
+						<div data-id="box3" style="background: yellow; width: 100px; height: 100px; border-radius: 200px;"></div>
+					</div>
+					<h2 style="margin-top: 20px;">Auto-Animate</h2>
+				</section>
+				<section data-background-gradient="linear-gradient(to bottom, #283b95, #17b2c3)" id="gradient-bg">
+					<h2 data-id="code-title">Code highlights,<br />meet scroll triggers</h2>
+					<pre data-id="code-animation"><code class="hljs javascript" data-trim data-line-numbers="|4,8-11|17|22-24"><script type="text/template">
+						import React, { useState } from 'react';
+
+						function Example() {
+						  const [count, setCount] = useState(0);
+
+						  return (
+						    <div>
+						      <p>You clicked {count} times</p>
+						      <button onClick={() => setCount(count + 1)}>
+						        Click me
+						      </button>
+						    </div>
+						  );
+						}
+
+						function SecondExample() {
+						  const [count, setCount] = useState(0);
+
+						  return (
+						    <div>
+						      <p>You clicked {count} times</p>
+						      <button onClick={() => setCount(count + 1)}>
+						        Click me
+						      </button>
+						    </div>
+						  );
+						}
+					</script></code></pre>
+				</section>
+				<section class="stack">
+          <section data-background="https://static.slid.es/reveal/image-placeholder.png" id="image-bg">
+            <h2>Image Backgrounds</h2>
+          </section>
+          <section data-background-video-muted data-background-video="https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.mp4,https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.webm">
+            <div style="background-color: rgba(0, 0, 0, 0.9); color: #fff; padding: 20px;">
+              <h2>Video background</h2>
+            </div>
+          </section>
+        </section>
+				<section><h2>The end</h2></section>
+
+			</div>
+
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script src="../plugin/notes/notes.js"></script>
+		<script src="../plugin/markdown/markdown.js"></script>
+		<script src="../plugin/highlight/highlight.js"></script>
+		<script>
+			Reveal.initialize({
+				view: 'scroll',
+				hash: true,
+
+				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes ]
+			});
+		</script>
+
+	</body>
+</html>

gulpfile.js

@@ -1,21 +1,20 @@
+const fs = require('fs');
 const pkg = require('./package.json')
-const path = require('path')
 const glob = require('glob')
 const yargs = require('yargs')
-const colors = require('colors')
+const through = require('through2');
 const qunit = require('node-qunit-puppeteer')
 
 const {rollup} = require('rollup')
-const {terser} = require('rollup-plugin-terser')
-const babel = require('rollup-plugin-babel')
+const terser = require('@rollup/plugin-terser')
+const babel = require('@rollup/plugin-babel').default
 const commonjs = require('@rollup/plugin-commonjs')
-const resolve = require('@rollup/plugin-node-resolve')
+const resolve = require('@rollup/plugin-node-resolve').default
+const sass = require('sass')
 
 const gulp = require('gulp')
-const tap = require('gulp-tap')
 const zip = require('gulp-zip')
-const sass = require('gulp-sass')
-const header = require('gulp-header')
+const header = require('gulp-header-comment')
 const eslint = require('gulp-eslint')
 const minify = require('gulp-clean-css')
 const connect = require('gulp-connect')
@@ -23,68 +22,79 @@ const autoprefixer = require('gulp-autoprefixer')
 
 const root = yargs.argv.root || '.'
 const port = yargs.argv.port || 8000
+const host = yargs.argv.host || 'localhost'
 
-const banner = `/*!
-* reveal.js ${pkg.version} (${new Date().toDateString()})
-* ${pkg.homepage}
-* MIT licensed
-*
-* Copyright (C) 2020 Hakim El Hattab, https://hakim.se
-*/\n`
+const cssLicense = `
+reveal.js ${pkg.version}
+${pkg.homepage}
+MIT licensed
+
+Copyright (C) 2011-2024 Hakim El Hattab, https://hakim.se
+`;
+
+const jsLicense = `/*!
+ * reveal.js ${pkg.version}
+ * ${pkg.homepage}
+ * MIT licensed
+ *
+ * Copyright (C) 2011-2024 Hakim El Hattab, https://hakim.se
+ */\n`;
 
 // Prevents warnings from opening too many test pages
 process.setMaxListeners(20);
 
 const babelConfig = {
-    exclude: 'node_modules/**',
+    babelHelpers: 'bundled',
+    ignore: ['node_modules'],
     compact: false,
     extensions: ['.js', '.html'],
-    plugins: ['transform-html-import-to-string'],
+    plugins: [
+        'transform-html-import-to-string'
+    ],
     presets: [[
         '@babel/preset-env',
         {
             corejs: 3,
-            useBuiltIns: 'entry',
+            useBuiltIns: 'usage',
             modules: false
         }
     ]]
 };
 
-const rollupConfig = {
-    plugins: [
-        babel( babelConfig ),
-        resolve(),
-        commonjs(),
-        terser()
-    ]
-};
-
-// Our ES module bundle only needs to support modern
-// browser features
+// Our ES module bundle only targets newer browsers with
+// module support. Browsers are targeted explicitly instead
+// of using the "esmodule: true" target since that leads to
+// polyfilling older browsers and a larger bundle.
 const babelConfigESM = JSON.parse( JSON.stringify( babelConfig ) );
-babelConfigESM.presets[0][1].targets = { esmodules: true };
+babelConfigESM.presets[0][1].targets = { browsers: [
+    'last 2 Chrome versions',
+    'last 2 Safari versions',
+    'last 2 iOS versions',
+    'last 2 Firefox versions',
+    'last 2 Edge versions',
+] };
 
-const rollupConfigESM = {
-    plugins: [
-        babel( babelConfigESM ),
-        resolve(),
-        commonjs(),
-        terser()
-    ]
-};
+let cache = {};
 
 // Creates a bundle with broad browser support, exposed
 // as UMD
 gulp.task('js-es5', () => {
     return rollup({
+        cache: cache.umd,
         input: 'js/index.js',
-        ...rollupConfig
+        plugins: [
+            resolve(),
+            commonjs(),
+            babel( babelConfig ),
+            terser()
+        ]
     }).then( bundle => {
+        cache.umd = bundle.cache;
         return bundle.write({
             name: 'Reveal',
             file: './dist/reveal.js',
             format: 'umd',
-            banner: banner,
+            banner: jsLicense,
             sourcemap: true
         });
     });
@@ -93,13 +103,20 @@ gulp.task('js-es5', () => {
 // Creates an ES module bundle
 gulp.task('js-es6', () => {
     return rollup({
+        cache: cache.esm,
         input: 'js/index.js',
-        ...rollupConfigESM
+        plugins: [
+            resolve(),
+            commonjs(),
+            babel( babelConfigESM ),
+            terser()
+        ]
     }).then( bundle => {
+        cache.esm = bundle.cache;
         return bundle.write({
             file: './dist/reveal.esm.js',
             format: 'es',
-            banner: banner,
+            banner: jsLicense,
             sourcemap: true
         });
     });
@@ -118,9 +135,19 @@ gulp.task('plugins', () => {
         { name: 'RevealMath', input: './plugin/math/plugin.js', output: './plugin/math/math' },
     ].map( plugin => {
         return rollup({
+                cache: cache[plugin.input],
                 input: plugin.input,
-                ...rollupConfig
+                plugins: [
+                    resolve(),
+                    commonjs(),
+                    babel({
+                        ...babelConfig,
+                        ignore: [/node_modules\/(?!(highlight\.js|marked)\/).*/],
+                    }),
+                    terser()
+                ]
             }).then( bundle => {
+                cache[plugin.input] = bundle.cache;
                 bundle.write({
                     file: plugin.output + '.esm.js',
                     name: plugin.name,
@@ -136,15 +163,37 @@ gulp.task('plugins', () => {
     } ));
 })
 
+// a custom pipeable step to transform Sass to CSS
+function compileSass() {
+  return through.obj( ( vinylFile, encoding, callback ) => {
+    const transformedFile = vinylFile.clone();
+
+    sass.render({
+        silenceDeprecations: ['legacy-js-api'],
+        data: transformedFile.contents.toString(),
+        file: transformedFile.path,
+    }, ( err, result ) => {
+        if( err ) {
+            callback(err);
+        }
+        else {
+            transformedFile.extname = '.css';
+            transformedFile.contents = result.css;
+            callback( null, transformedFile );
+        }
+    });
+  });
+}
+
 gulp.task('css-themes', () => gulp.src(['./css/theme/source/*.{sass,scss}'])
-        .pipe(sass())
+        .pipe(compileSass())
         .pipe(gulp.dest('./dist/theme')))
 
 gulp.task('css-core', () => gulp.src(['css/reveal.scss'])
-    .pipe(sass())
+    .pipe(compileSass())
     .pipe(autoprefixer())
     .pipe(minify({compatibility: 'ie9'}))
-    .pipe(header(banner))
+    .pipe(header(cssLicense))
     .pipe(gulp.dest('./dist')))
 
 gulp.task('css', gulp.parallel('css-themes', 'css-core'))
@@ -154,7 +203,7 @@ gulp.task('qunit', () => {
     let serverConfig = {
         root,
         port: 8009,
-        host: '0.0.0.0',
+        host: 'localhost',
         name: 'test-server'
     }
 
@@ -171,7 +220,7 @@ gulp.task('qunit', () => {
                 targetUrl: `http://${serverConfig.host}:${serverConfig.port}/${filename}`,
                 timeout: 20000,
                 redirectConsole: false,
-                puppeteerArgs: ['--allow-file-access-from-files']
+                puppeteerArgs: ['--allow-file-access-from-files', '--no-sandbox']
             })
                 .then(result => {
                     if( result.stats.failed > 0 ) {
@@ -226,42 +275,57 @@ gulp.task('default', gulp.series(gulp.parallel('js', 'css', 'plugins'), 'test'))
 
 gulp.task('build', gulp.parallel('js', 'css', 'plugins'))
 
-gulp.task('package', gulp.series('default', () =>
+gulp.task('package', gulp.series(async () => {
 
-    gulp.src([
+    let dirs = [
         './index.html',
         './dist/**',
-        './lib/**',
-        './images/**',
         './plugin/**',
-        './**.md'
-    ]).pipe(zip('reveal-js-presentation.zip')).pipe(gulp.dest('./'))
+        './*/*.md'
+    ];
 
-))
+    if (fs.existsSync('./lib')) dirs.push('./lib/**');
+    if (fs.existsSync('./images')) dirs.push('./images/**');
+    if (fs.existsSync('./slides')) dirs.push('./slides/**');
+
+    return gulp.src( dirs, { base: './', encoding: false } )
+    .pipe(zip('reveal-js-presentation.zip')).pipe(gulp.dest('./'))
+
+}))
+
+gulp.task('reload', () => gulp.src(['index.html'])
+    .pipe(connect.reload()));
 
 gulp.task('serve', () => {
 
     connect.server({
         root: root,
         port: port,
-        host: '0.0.0.0',
+        host: host,
         livereload: true
     })
 
-    gulp.watch(['js/**'], gulp.series('js', 'test'))
+    const slidesRoot = root.endsWith('/') ? root : root + '/'
+    gulp.watch([
+        slidesRoot + '**/*.html',
+        slidesRoot + '**/*.md',
+        `!${slidesRoot}**/node_modules/**`, // ignore node_modules
+    ], gulp.series('reload'))
 
-    gulp.watch(['plugin/**/plugin.js'], gulp.series('plugins'))
+    gulp.watch(['js/**'], gulp.series('js', 'reload', 'eslint'))
 
-    gulp.watch(['test/*.html'], gulp.series('test'))
+    gulp.watch(['plugin/**/plugin.js', 'plugin/**/*.html'], gulp.series('plugins', 'reload'))
 
     gulp.watch([
-        'css/theme/source/*.{sass,scss}',
+        'css/theme/source/**/*.{sass,scss}',
         'css/theme/template/*.{sass,scss}',
-    ], gulp.series('css-themes'))
+    ], gulp.series('css-themes', 'reload'))
 
     gulp.watch([
         'css/*.scss',
         'css/print/*.{sass,scss,css}'
-    ], gulp.series('css-core'))
+    ], gulp.series('css-core', 'reload'))
 
-})
+    gulp.watch(['test/*.html'], gulp.series('test'))
+
+})

index.html

@@ -1,5 +1,5 @@
 <!doctype html>
-<html>
+<html lang="en">
 	<head>
 		<meta charset="utf-8">
 		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
@@ -8,10 +8,10 @@
 
 		<link rel="stylesheet" href="dist/reset.css">
 		<link rel="stylesheet" href="dist/reveal.css">
-		<link rel="stylesheet" href="dist/theme/black.css" id="theme">
+		<link rel="stylesheet" href="dist/theme/black.css">
 
 		<!-- Theme used for syntax highlighted code -->
-		<link rel="stylesheet" href="plugin/highlight/monokai.css" id="highlight-theme">
+		<link rel="stylesheet" href="plugin/highlight/monokai.css">
 	</head>
 	<body>
 		<div class="reveal">
@@ -27,12 +27,12 @@
 		<script src="plugin/highlight/highlight.js"></script>
 		<script>
 			// More info about initialization & config:
-			// - https://revealjs.netlify.app/initialization/
-			// - https://revealjs.netlify.app/config/
+			// - https://revealjs.com/initialization/
+			// - https://revealjs.com/config/
 			Reveal.initialize({
 				hash: true,
 
-				// Learn about plugins: https://revealjs.netlify.app/plugins/
+				// Learn about plugins: https://revealjs.com/plugins/
 				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes ]
 			});
 		</script>

js/config.js

@@ -15,7 +15,10 @@ export default {
 	minScale: 0.2,
 	maxScale: 2.0,
 
-	// Display presentation control arrows
+	// Display presentation control arrows.
+	// - true: Display controls on all screens
+	// - false: Hide controls on all screens
+	// - "speaker-only": Only display controls in the speaker view
 	controls: true,
 
 	// Help the user learn the controls by providing hints, for example by
@@ -65,16 +68,19 @@ export default {
 	// Flags if we should monitor the hash and change slides accordingly
 	respondToHashChanges: true,
 
+	// Enable support for jump-to-slide navigation shortcuts
+	jumpToSlide: true,
+
 	// Push each slide change to the browser history.  Implies `hash: true`
 	history: false,
 
 	// Enable keyboard shortcuts for navigation
 	keyboard: true,
 
-	// Optional function that blocks keyboard events when retuning false
+	// Optional function that blocks keyboard events when returning false
 	//
-	// If you set this to 'foucsed', we will only capture keyboard events
-	// for embdedded decks when they are in focus
+	// If you set this to 'focused', we will only capture keyboard events
+	// for embedded decks when they are in focus
 	keyboardCondition: null,
 
 	// Disables the default reveal.js slide layout (scaling and centering)
@@ -146,7 +152,10 @@ export default {
 	// Flags if speaker notes should be visible to all viewers
 	showNotes: false,
 
-	// Global override for autolaying embedded media (video/audio/iframe)
+	// Flags if slides with data-visibility="hidden" should be kep visible
+	showHiddenSlides: false,
+
+	// Global override for autoplaying embedded media (video/audio/iframe)
 	// - null:   Media will only autoplay if data-autoplay is present
 	// - true:   All media will autoplay, regardless of individual setting
 	// - false:  No media will autoplay, regardless of individual setting
@@ -250,6 +259,36 @@ export default {
 	parallaxBackgroundHorizontal: null,
 	parallaxBackgroundVertical: null,
 
+	// Can be used to initialize reveal.js in one of the following views:
+	// - print:   Render the presentation so that it can be printed to PDF
+	// - scroll:  Show the presentation as a tall scrollable page with scroll
+	//            triggered animations
+	view: null,
+
+	// Adjusts the height of each slide in the scroll view.
+	// - full:       Each slide is as tall as the viewport
+	// - compact:    Slides are as small as possible, allowing multiple slides
+	//               to be visible in parallel on tall devices
+	scrollLayout: 'full',
+
+	// Control how scroll snapping works in the scroll view.
+	// - false:   	No snapping, scrolling is continuous
+	// - proximity:  Snap when close to a slide
+	// - mandatory:  Always snap to the closest slide
+	//
+	// Only applies to presentations in scroll view.
+	scrollSnap: 'mandatory',
+
+	// Enables and configure the scroll view progress bar.
+	// - 'auto':    Show the scrollbar while scrolling, hide while idle
+	// - true:      Always show the scrollbar
+	// - false:     Never show the scrollbar
+	scrollProgress: 'auto',
+
+	// Automatically activate the scroll view when we the viewport falls
+	// below the given width.
+	scrollActivationWidth: 435,
+
 	// The maximum number of pages a single slide can expand onto when printing
 	// to PDF, unlimited by default
 	pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
@@ -281,6 +320,10 @@ export default {
 	// Time before the cursor is hidden (in ms)
 	hideCursorTime: 5000,
 
+	// Should we automatically sort and set indices for fragments
+	// at each sync? (See Reveal.sync)
+	sortFragmentsOnSync: true,
+
 	// Script dependencies to load
 	dependencies: [],
 

js/controllers/autoanimate.js

@@ -1,6 +1,9 @@
-import { queryAll, extend, createStyleSheet } from '../utils/util.js'
+import { queryAll, extend, createStyleSheet, matches, closest } from '../utils/util.js'
 import { FRAGMENT_STYLE_REGEX } from '../utils/constants.js'
 
+// Counter used to generate unique IDs for auto-animated elements
+let autoAnimateCounter = 0;
+
 /**
  * Automatically animates matching elements across
  * slides with the [data-auto-animate] attribute.
@@ -11,9 +14,6 @@ export default class AutoAnimate {
 
 		this.Reveal = Reveal;
 
-		// Counter used to generate unique IDs for auto-animated elements
-		this.autoAnimateCounter = 0;
-
 	}
 
 	/**
@@ -27,8 +27,19 @@ export default class AutoAnimate {
 		// Clean up after prior animations
 		this.reset();
 
-		// Ensure that both slides are auto-animate targets
-		if( fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' ) ) {
+		let allSlides = this.Reveal.getSlides();
+		let toSlideIndex = allSlides.indexOf( toSlide );
+		let fromSlideIndex = allSlides.indexOf( fromSlide );
+
+		// Ensure that;
+		// 1. Both slides exist.
+		// 2. Both slides are auto-animate targets with the same
+		//    data-auto-animate-id value (including null if absent on both).
+		// 3. data-auto-animate-restart isn't set on the physically latter
+		//    slide (independent of slide direction).
+		if( fromSlide && toSlide && fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' )
+				&& fromSlide.getAttribute( 'data-auto-animate-id' ) === toSlide.getAttribute( 'data-auto-animate-id' ) 
+				&& !( toSlideIndex > fromSlideIndex ? toSlide : fromSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {
 
 			// Create a new auto-animate sheet
 			this.autoAnimateStyleSheet = this.autoAnimateStyleSheet || createStyleSheet();
@@ -40,14 +51,21 @@ export default class AutoAnimate {
 			toSlide.dataset.autoAnimate = 'pending';
 
 			// Flag the navigation direction, needed for fragment buildup
-			let allSlides = this.Reveal.getSlides();
-			animationOptions.slideDirection = allSlides.indexOf( toSlide ) > allSlides.indexOf( fromSlide ) ? 'forward' : 'backward';
+			animationOptions.slideDirection = toSlideIndex > fromSlideIndex ? 'forward' : 'backward';
+
+			// If the from-slide is hidden because it has moved outside
+			// the view distance, we need to temporarily show it while
+			// measuring
+			let fromSlideIsHidden = fromSlide.style.display === 'none';
+			if( fromSlideIsHidden ) fromSlide.style.display = this.Reveal.getConfig().display;
 
 			// Inject our auto-animate styles for this transition
 			let css = this.getAutoAnimatableElements( fromSlide, toSlide ).map( elements => {
-				return this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, this.autoAnimateCounter++ );
+				return this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, autoAnimateCounter++ );
 			} );
 
+			if( fromSlideIsHidden ) fromSlide.style.display = 'none';
+
 			// Animate unmatched elements, if enabled
 			if( toSlide.dataset.autoAnimateUnmatched !== 'false' && this.Reveal.getConfig().autoAnimateUnmatched === true ) {
 
@@ -63,7 +81,7 @@ export default class AutoAnimate {
 					// If there is a duration or delay set specifically for this
 					// element our unmatched elements should adhere to those
 					if( unmatchedOptions.duration !== animationOptions.duration || unmatchedOptions.delay !== animationOptions.delay ) {
-						id = 'unmatched-' + this.autoAnimateCounter++;
+						id = 'unmatched-' + autoAnimateCounter++;
 						css.push( `[data-auto-animate="running"] [data-auto-animate-target="${id}"] { transition: opacity ${unmatchedOptions.duration}s ease ${unmatchedOptions.delay}s; }` );
 					}
 
@@ -160,28 +178,12 @@ export default class AutoAnimate {
 		let fromProps = this.getAutoAnimatableProperties( 'from', from, elementOptions ),
 			toProps = this.getAutoAnimatableProperties( 'to', to, elementOptions );
 
-		// Maintain fragment visibility for matching elements when
-		// we're navigating forwards, this way the viewer won't need
-		// to step through the same fragments twice
 		if( to.classList.contains( 'fragment' ) ) {
 
 			// Don't auto-animate the opacity of fragments to avoid
 			// conflicts with fragment animations
 			delete toProps.styles['opacity'];
 
-			if( from.classList.contains( 'fragment' ) ) {
-
-				let fromFragmentStyle = ( from.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];
-				let toFragmentStyle = ( to.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];
-
-				// Only skip the fragment if the fragment animation style
-				// remains unchanged
-				if( fromFragmentStyle === toFragmentStyle && animationOptions.slideDirection === 'forward' ) {
-					to.classList.add( 'visible', 'disabled' );
-				}
-
-			}
-
 		}
 
 		// If translation and/or scaling are enabled, css transform
@@ -299,8 +301,8 @@ export default class AutoAnimate {
 		options = extend( options, inheritedOptions );
 
 		// Inherit options from parent elements
-		if( element.closest && element.parentNode ) {
-			let autoAnimatedParent = element.parentNode.closest( '[data-auto-animate-target]' );
+		if( element.parentNode ) {
+			let autoAnimatedParent = closest( element.parentNode, '[data-auto-animate-target]' );
 			if( autoAnimatedParent ) {
 				options = this.getAutoAnimateOptions( autoAnimatedParent, options );
 			}
@@ -384,7 +386,14 @@ export default class AutoAnimate {
 				value = { value: style.to, explicitValue: true };
 			}
 			else {
-				value = computedStyles[style.property];
+				// Use a unitless value for line-height so that it inherits properly
+				if( style.property === 'line-height' ) {
+					value = parseFloat( computedStyles['line-height'] ) / parseFloat( computedStyles['font-size'] );
+				}
+
+				if( isNaN(value) ) {
+					value = computedStyles[style.property];
+				}
 			}
 
 			if( value !== '' ) {
@@ -439,14 +448,14 @@ export default class AutoAnimate {
 		const textNodes = 'h1, h2, h3, h4, h5, h6, p, li';
 		const mediaNodes = 'img, video, iframe';
 
-		// Eplicit matches via data-id
+		// Explicit matches via data-id
 		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {
 			return node.nodeName + ':::' + node.getAttribute( 'data-id' );
 		} );
 
 		// Text
 		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, node => {
-			return node.nodeName + ':::' + node.innerText;
+			return node.nodeName + ':::' + node.textContent.trim();
 		} );
 
 		// Media
@@ -456,18 +465,17 @@ export default class AutoAnimate {
 
 		// Code
 		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, node => {
-			return node.nodeName + ':::' + node.innerText;
+			return node.nodeName + ':::' + node.textContent.trim();
 		} );
 
 		pairs.forEach( pair => {
-
-			// Disable scale transformations on text nodes, we transiition
+			// Disable scale transformations on text nodes, we transition
 			// each individual text property instead
-			if( pair.from.matches( textNodes ) ) {
+			if( matches( pair.from, textNodes ) ) {
 				pair.options = { scale: false };
 			}
 			// Animate individual lines of code
-			else if( pair.from.matches( codeNodes ) ) {
+			else if( matches( pair.from, codeNodes ) ) {
 
 				// Transition the code block's width and height instead of scaling
 				// to prevent its content from being squished
@@ -483,7 +491,7 @@ export default class AutoAnimate {
 				} );
 
 				// Line numbers
-				this.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', node => {
+				this.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-numbers[data-line-number]', node => {
 					return node.getAttribute( 'data-line-number' );
 				}, {
 					scale: false,
@@ -552,14 +560,14 @@ export default class AutoAnimate {
 
 			// Retrieve the 'from' element
 			if( fromMatches[key] ) {
-				const pimaryIndex = toMatches[key].length - 1;
+				const primaryIndex = toMatches[key].length - 1;
 				const secondaryIndex = fromMatches[key].length - 1;
 
 				// If there are multiple identical from elements, retrieve
 				// the one at the same index as our to-element.
-				if( fromMatches[key][ pimaryIndex ] ) {
-					fromElement = fromMatches[key][ pimaryIndex ];
-					fromMatches[key][ pimaryIndex ] = null;
+				if( fromMatches[key][ primaryIndex ] ) {
+					fromElement = fromMatches[key][ primaryIndex ];
+					fromMatches[key][ primaryIndex ] = null;
 				}
 				// If there are no matching from-elements at the same index,
 				// use the last one.
@@ -587,7 +595,7 @@ export default class AutoAnimate {
 	 * fading of unmatched elements is turned on, these elements
 	 * will fade when going between auto-animate slides.
 	 *
-	 * Note that parents of auto-animate targets are NOT considerd
+	 * Note that parents of auto-animate targets are NOT considered
 	 * unmatched since fading them would break the auto-animation.
 	 *
 	 * @param {HTMLElement} rootElement
@@ -616,4 +624,4 @@ export default class AutoAnimate {
 
 	}
 
-}
+}

js/controllers/backgrounds.js

@@ -27,8 +27,6 @@ export default class Backgrounds {
 	 */
 	create() {
 
-		let printMode = this.Reveal.isPrintingPDF();
-
 		// Clear prior backgrounds
 		this.element.innerHTML = '';
 		this.element.classList.add( 'no-transition' );
@@ -114,9 +112,25 @@ export default class Backgrounds {
 	 */
 	sync( slide ) {
 
-		let element = slide.slideBackgroundElement,
+		const element = slide.slideBackgroundElement,
 			contentElement = slide.slideBackgroundContentElement;
 
+		const data = {
+			background: slide.getAttribute( 'data-background' ),
+			backgroundSize: slide.getAttribute( 'data-background-size' ),
+			backgroundImage: slide.getAttribute( 'data-background-image' ),
+			backgroundVideo: slide.getAttribute( 'data-background-video' ),
+			backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
+			backgroundColor: slide.getAttribute( 'data-background-color' ),
+			backgroundGradient: slide.getAttribute( 'data-background-gradient' ),
+			backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
+			backgroundPosition: slide.getAttribute( 'data-background-position' ),
+			backgroundTransition: slide.getAttribute( 'data-background-transition' ),
+			backgroundOpacity: slide.getAttribute( 'data-background-opacity' ),
+		};
+
+		const dataPreload = slide.hasAttribute( 'data-preload' );
+
 		// Reset the prior background state in case this is not the
 		// initial sync
 		slide.classList.remove( 'has-dark-background' );
@@ -135,22 +149,9 @@ export default class Backgrounds {
 		contentElement.style.opacity = '';
 		contentElement.innerHTML = '';
 
-		let data = {
-			background: slide.getAttribute( 'data-background' ),
-			backgroundSize: slide.getAttribute( 'data-background-size' ),
-			backgroundImage: slide.getAttribute( 'data-background-image' ),
-			backgroundVideo: slide.getAttribute( 'data-background-video' ),
-			backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
-			backgroundColor: slide.getAttribute( 'data-background-color' ),
-			backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
-			backgroundPosition: slide.getAttribute( 'data-background-position' ),
-			backgroundTransition: slide.getAttribute( 'data-background-transition' ),
-			backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
-		};
-
 		if( data.background ) {
 			// Auto-wrap image urls in url(...)
-			if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
+			if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp|webp)([?#\s]|$)/gi.test( data.background ) ) {
 				slide.setAttribute( 'data-background-image', data.background );
 			}
 			else {
@@ -161,13 +162,14 @@ export default class Backgrounds {
 		// Create a hash for this combination of background settings.
 		// This is used to determine when two slide backgrounds are
 		// the same.
-		if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
+		if( data.background || data.backgroundColor || data.backgroundGradient || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
 			element.setAttribute( 'data-background-hash', data.background +
 															data.backgroundSize +
 															data.backgroundImage +
 															data.backgroundVideo +
 															data.backgroundIframe +
 															data.backgroundColor +
+															data.backgroundGradient +
 															data.backgroundRepeat +
 															data.backgroundPosition +
 															data.backgroundTransition +
@@ -177,9 +179,10 @@ export default class Backgrounds {
 		// Additional and optional background properties
 		if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
 		if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
+		if( data.backgroundGradient ) element.style.backgroundImage = data.backgroundGradient;
 		if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
 
-		if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' );
+		if( dataPreload ) element.setAttribute( 'data-preload', '' );
 
 		// Background image options are set on the content wrapper
 		if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
@@ -187,13 +190,33 @@ export default class Backgrounds {
 		if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
 		if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
 
+		const contrastClass = this.getContrastClass( slide );
+
+		if( typeof contrastClass === 'string' ) {
+			slide.classList.add( contrastClass );
+		}
+
+	}
+
+	/**
+	 * Returns a class name that can be applied to a slide to indicate
+	 * if it has a light or dark background.
+	 *
+	 * @param {*} slide
+	 *
+	 * @returns {string|null}
+	 */
+	getContrastClass( slide ) {
+
+		const element = slide.slideBackgroundElement;
+
 		// If this slide has a background color, we add a class that
 		// signals if it is light or dark. If the slide has no background
 		// color, no class will be added
-		let contrastColor = data.backgroundColor;
+		let contrastColor = slide.getAttribute( 'data-background-color' );
 
-		// If no bg color was found, check the computed background
-		if( !contrastColor ) {
+		// If no bg color was found, or it cannot be converted by colorToRgb, check the computed background
+		if( !contrastColor || !colorToRgb( contrastColor ) ) {
 			let computedBackgroundStyle = window.getComputedStyle( element );
 			if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
 				contrastColor = computedBackgroundStyle.backgroundColor;
@@ -201,21 +224,39 @@ export default class Backgrounds {
 		}
 
 		if( contrastColor ) {
-			let rgb = colorToRgb( contrastColor );
+			const rgb = colorToRgb( contrastColor );
 
 			// Ignore fully transparent backgrounds. Some browsers return
 			// rgba(0,0,0,0) when reading the computed background color of
 			// an element with no background
 			if( rgb && rgb.a !== 0 ) {
 				if( colorBrightness( contrastColor ) < 128 ) {
-					slide.classList.add( 'has-dark-background' );
+					return 'has-dark-background';
 				}
 				else {
-					slide.classList.add( 'has-light-background' );
+					return 'has-light-background';
 				}
 			}
 		}
 
+		return null;
+
+	}
+
+	/**
+	 * Bubble the 'has-light-background'/'has-dark-background' classes.
+	 */
+	bubbleSlideContrastClassToElement( slide, target ) {
+
+		[ 'has-light-background', 'has-dark-background' ].forEach( classToBubble => {
+			if( slide.classList.contains( classToBubble ) ) {
+				target.classList.add( classToBubble );
+			}
+			else {
+				target.classList.remove( classToBubble );
+			}
+		}, this );
+
 	}
 
 	/**
@@ -227,14 +268,15 @@ export default class Backgrounds {
 	 */
 	update( includeAll = false ) {
 
+		let config = this.Reveal.getConfig();
 		let currentSlide = this.Reveal.getCurrentSlide();
 		let indices = this.Reveal.getIndices();
 
 		let currentBackground = null;
 
 		// Reverse past/future classes when in RTL mode
-		let horizontalPast = this.Reveal.getConfig().rtl ? 'future' : 'past',
-			horizontalFuture = this.Reveal.getConfig().rtl ? 'past' : 'future';
+		let horizontalPast = config.rtl ? 'future' : 'past',
+			horizontalFuture = config.rtl ? 'past' : 'future';
 
 		// Update the classes of all backgrounds to match the
 		// states of their slides (past/present/future)
@@ -260,10 +302,12 @@ export default class Backgrounds {
 
 					backgroundv.classList.remove( 'past', 'present', 'future' );
 
-					if( v < indices.v ) {
+					const indexv = typeof indices.v === 'number' ? indices.v : 0;
+
+					if( v < indexv ) {
 						backgroundv.classList.add( 'past' );
 					}
-					else if ( v > indices.v ) {
+					else if ( v > indexv ) {
 						backgroundv.classList.add( 'future' );
 					}
 					else {
@@ -278,15 +322,53 @@ export default class Backgrounds {
 
 		} );
 
+		// The previous background may refer to a DOM element that has
+		// been removed after a presentation is synced & bgs are recreated
+		if( this.previousBackground && !this.previousBackground.closest( 'body' ) ) {
+			this.previousBackground = null;
+		}
+
+		if( currentBackground && this.previousBackground ) {
+
+			// Don't transition between identical backgrounds. This
+			// prevents unwanted flicker.
+			let previousBackgroundHash = this.previousBackground.getAttribute( 'data-background-hash' );
+			let currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
+
+			if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {
+				this.element.classList.add( 'no-transition' );
+
+				// If multiple slides have the same background video, carry
+				// the <video> element forward so that it plays continuously
+				// across multiple slides
+				const currentVideo = currentBackground.querySelector( 'video' );
+				const previousVideo = this.previousBackground.querySelector( 'video' );
+
+				if( currentVideo && previousVideo ) {
+
+					const currentVideoParent = currentVideo.parentNode;
+					const previousVideoParent = previousVideo.parentNode;
+
+					// Swap the two videos
+					previousVideoParent.appendChild( currentVideo );
+					currentVideoParent.appendChild( previousVideo );
+
+				}
+			}
+
+		}
+
+		const backgroundChanged = currentBackground !== this.previousBackground;
+
 		// Stop content inside of previous backgrounds
-		if( this.previousBackground ) {
+		if( backgroundChanged && this.previousBackground ) {
 
 			this.Reveal.slideContent.stopEmbeddedContent( this.previousBackground, { unloadIframes: !this.Reveal.slideContent.shouldPreload( this.previousBackground ) } );
 
 		}
 
 		// Start content in the current background
-		if( currentBackground ) {
+		if( backgroundChanged && currentBackground ) {
 
 			this.Reveal.slideContent.startEmbeddedContent( currentBackground );
 
@@ -304,14 +386,6 @@ export default class Backgrounds {
 
 			}
 
-			// Don't transition between identical backgrounds. This
-			// prevents unwanted flicker.
-			let previousBackgroundHash = this.previousBackground ? this.previousBackground.getAttribute( 'data-background-hash' ) : null;
-			let currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
-			if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {
-				this.element.classList.add( 'no-transition' );
-			}
-
 			this.previousBackground = currentBackground;
 
 		}
@@ -319,20 +393,13 @@ export default class Backgrounds {
 		// If there's a background brightness flag for this slide,
 		// bubble it to the .reveal container
 		if( currentSlide ) {
-			[ 'has-light-background', 'has-dark-background' ].forEach( classToBubble => {
-				if( currentSlide.classList.contains( classToBubble ) ) {
-					this.Reveal.getRevealElement().classList.add( classToBubble );
-				}
-				else {
-					this.Reveal.getRevealElement().classList.remove( classToBubble );
-				}
-			}, this );
+			this.bubbleSlideContrastClassToElement( currentSlide, this.Reveal.getRevealElement() );
 		}
 
 		// Allow the first background to apply without transition
 		setTimeout( () => {
 			this.element.classList.remove( 'no-transition' );
-		}, 1 );
+		}, 10 );
 
 	}
 
@@ -394,4 +461,10 @@ export default class Backgrounds {
 
 	}
 
-}
+	destroy() {
+
+		this.element.remove();
+
+	}
+
+}

js/controllers/controls.js

@@ -1,4 +1,4 @@
-import { queryAll } from '../utils/util.js'
+import { queryAll, enterFullscreen } from '../utils/util.js'
 import { isAndroid } from '../utils/device.js'
 
 /**
@@ -12,6 +12,7 @@ import { isAndroid } from '../utils/device.js'
  * - .navigate-left
  * - .navigate-next
  * - .navigate-prev
+ * - .enter-fullscreen
  */
 export default class Controls {
 
@@ -25,6 +26,7 @@ export default class Controls {
 		this.onNavigateDownClicked = this.onNavigateDownClicked.bind( this );
 		this.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this );
 		this.onNavigateNextClicked = this.onNavigateNextClicked.bind( this );
+		this.onEnterFullscreen = this.onEnterFullscreen.bind( this );
 
 	}
 
@@ -50,6 +52,7 @@ export default class Controls {
 		this.controlsDown = queryAll( revealElement, '.navigate-down' );
 		this.controlsPrev = queryAll( revealElement, '.navigate-prev' );
 		this.controlsNext = queryAll( revealElement, '.navigate-next' );
+		this.controlsFullscreen = queryAll( revealElement, '.enter-fullscreen' );
 
 		// The left, right and down arrows in the standard reveal.js controls
 		this.controlsRightArrow = this.element.querySelector( '.navigate-right' );
@@ -63,7 +66,10 @@ export default class Controls {
 	 */
 	configure( config, oldConfig ) {
 
-		this.element.style.display = config.controls ? 'block' : 'none';
+		this.element.style.display = (
+			config.controls &&
+			(config.controls !== 'speaker-only' || this.Reveal.isSpeakerNotes())
+		) ? 'block' : 'none';
 
 		this.element.setAttribute( 'data-controls-layout', config.controlsLayout );
 		this.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
@@ -89,6 +95,7 @@ export default class Controls {
 			this.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) );
 			this.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) );
 			this.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) );
+			this.controlsFullscreen.forEach( el => el.addEventListener( eventName, this.onEnterFullscreen, false ) );
 		} );
 
 	}
@@ -102,6 +109,7 @@ export default class Controls {
 			this.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) );
 			this.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) );
 			this.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) );
+			this.controlsFullscreen.forEach( el => el.removeEventListener( eventName, this.onEnterFullscreen, false ) );
 		} );
 
 	}
@@ -141,9 +149,14 @@ export default class Controls {
 			if( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
 			if( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
 
+			const isVerticalStack = this.Reveal.isVerticalSlide( currentSlide );
+			const hasVerticalSiblings = isVerticalStack &&
+																	currentSlide.parentElement &&
+																	currentSlide.parentElement.querySelectorAll( ':scope > section' ).length > 1;
+
 			// Apply fragment decorators to directional buttons based on
 			// what slide axis they are in
-			if( this.Reveal.isVerticalSlide( currentSlide ) ) {
+			if( isVerticalStack && hasVerticalSiblings ) {
 				if( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
 				if( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
 			}
@@ -188,6 +201,13 @@ export default class Controls {
 		}
 	}
 
+	destroy() {
+
+		this.unbind();
+		this.element.remove();
+
+	}
+
 	/**
 	 * Event handlers for navigation control buttons.
 	 */
@@ -255,5 +275,13 @@ export default class Controls {
 
 	}
 
+	onEnterFullscreen( event ) {
+
+		const config = this.Reveal.getConfig();
+		const viewport = this.Reveal.getViewportElement();
+
+		enterFullscreen( config.embedded ? viewport : viewport.parentElement );
+
+	}
 
 }

js/controllers/focus.js

@@ -1,3 +1,5 @@
+import { closest } from '../utils/util.js'
+
 /**
  * Manages focus when a presentation is embedded. This
  * helps us only capture keyboard from the presentation
@@ -77,6 +79,12 @@ export default class Focus {
 
 	}
 
+	destroy() {
+
+		this.Reveal.getRevealElement().classList.remove( 'focused' );
+
+	}
+
 	onRevealPointerDown( event ) {
 
 		this.focus();
@@ -85,7 +93,7 @@ export default class Focus {
 
 	onDocumentPointerDown( event ) {
 
-		let revealElement = event.target.closest( '.reveal' );
+		let revealElement = closest( event.target, '.reveal' );
 		if( !revealElement || revealElement !== this.Reveal.getRevealElement() ) {
 			this.blur();
 		}

js/controllers/fragments.js

@@ -174,24 +174,23 @@ export default class Fragments {
 	 *
 	 * @return {{shown: array, hidden: array}}
 	 */
-	update( index, fragments ) {
+	update( index, fragments, slide = this.Reveal.getCurrentSlide() ) {
 
 		let changedFragments = {
 			shown: [],
 			hidden: []
 		};
 
-		let currentSlide = this.Reveal.getCurrentSlide();
-		if( currentSlide && this.Reveal.getConfig().fragments ) {
+		if( slide && this.Reveal.getConfig().fragments ) {
 
-			fragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );
+			fragments = fragments || this.sort( slide.querySelectorAll( '.fragment' ) );
 
 			if( fragments.length ) {
 
 				let maxIndex = 0;
 
 				if( typeof index !== 'number' ) {
-					let currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
+					let currentFragment = this.sort( slide.querySelectorAll( '.fragment.visible' ) ).pop();
 					if( currentFragment ) {
 						index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
 					}
@@ -235,6 +234,7 @@ export default class Fragments {
 						el.classList.remove( 'current-fragment' );
 
 						if( wasVisible ) {
+							this.Reveal.slideContent.stopEmbeddedContent( el );
 							changedFragments.hidden.push( el );
 							this.Reveal.dispatchEvent({
 								target: el,
@@ -251,12 +251,32 @@ export default class Fragments {
 				// the current fragment index.
 				index = typeof index === 'number' ? index : -1;
 				index = Math.max( Math.min( index, maxIndex ), -1 );
-				currentSlide.setAttribute( 'data-fragment', index );
+				slide.setAttribute( 'data-fragment', index );
 
 			}
 
 		}
 
+		if( changedFragments.hidden.length ) {
+			this.Reveal.dispatchEvent({
+				type: 'fragmenthidden',
+				data: {
+					fragment: changedFragments.hidden[0],
+					fragments: changedFragments.hidden
+				}
+			});
+		}
+
+		if( changedFragments.shown.length ) {
+			this.Reveal.dispatchEvent({
+				type: 'fragmentshown',
+				data: {
+					fragment: changedFragments.shown[0],
+					fragments: changedFragments.shown
+				}
+			});
+		}
+
 		return changedFragments;
 
 	}
@@ -311,26 +331,6 @@ export default class Fragments {
 
 				let changedFragments = this.update( index, fragments );
 
-				if( changedFragments.hidden.length ) {
-					this.Reveal.dispatchEvent({
-						type: 'fragmenthidden',
-						data: {
-							fragment: changedFragments.hidden[0],
-							fragments: changedFragments.hidden
-						}
-					});
-				}
-
-				if( changedFragments.shown.length ) {
-					this.Reveal.dispatchEvent({
-						type: 'fragmentshown',
-						data: {
-							fragment: changedFragments.shown[0],
-							fragments: changedFragments.shown
-						}
-					});
-				}
-
 				this.Reveal.controls.update();
 				this.Reveal.progress.update();
 

js/controllers/jumptoslide.js

@@ -0,0 +1,197 @@
+import {
+	SLIDE_NUMBER_FORMAT_CURRENT,
+	SLIDE_NUMBER_FORMAT_CURRENT_SLASH_TOTAL
+} from "../utils/constants";
+
+/**
+ * Makes it possible to jump to a slide by entering its
+ * slide number or id.
+ */
+export default class JumpToSlide {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.onInput = this.onInput.bind( this );
+		this.onBlur = this.onBlur.bind( this );
+		this.onKeyDown = this.onKeyDown.bind( this );
+
+	}
+
+	render() {
+
+		this.element = document.createElement( 'div' );
+		this.element.className = 'jump-to-slide';
+
+    this.jumpInput = document.createElement( 'input' );
+    this.jumpInput.type = 'text';
+    this.jumpInput.className = 'jump-to-slide-input';
+    this.jumpInput.placeholder = 'Jump to slide';
+		this.jumpInput.addEventListener( 'input', this.onInput );
+		this.jumpInput.addEventListener( 'keydown', this.onKeyDown );
+		this.jumpInput.addEventListener( 'blur', this.onBlur );
+
+    this.element.appendChild( this.jumpInput );
+
+	}
+
+	show() {
+
+		this.indicesOnShow = this.Reveal.getIndices();
+
+		this.Reveal.getRevealElement().appendChild( this.element );
+		this.jumpInput.focus();
+
+	}
+
+	hide() {
+
+		if( this.isVisible() ) {
+			this.element.remove();
+			this.jumpInput.value = '';
+
+			clearTimeout( this.jumpTimeout );
+			delete this.jumpTimeout;
+		}
+
+	}
+
+	isVisible() {
+
+		return !!this.element.parentNode;
+
+	}
+
+	/**
+	 * Parses the current input and jumps to the given slide.
+	 */
+	jump() {
+
+		clearTimeout( this.jumpTimeout );
+		delete this.jumpTimeout;
+
+		let query = this.jumpInput.value.trim( '' );
+		let indices;
+
+		// When slide numbers are formatted to be a single linear number
+		// (instead of showing a separate horizontal/vertical index) we
+		// use the same format for slide jumps
+		if( /^\d+$/.test( query ) ) {
+			const slideNumberFormat = this.Reveal.getConfig().slideNumber;
+			if( slideNumberFormat === SLIDE_NUMBER_FORMAT_CURRENT || slideNumberFormat === SLIDE_NUMBER_FORMAT_CURRENT_SLASH_TOTAL ) {
+				const slide = this.Reveal.getSlides()[ parseInt( query, 10 ) - 1 ];
+				if( slide ) {
+					indices = this.Reveal.getIndices( slide );
+				}
+			}
+		}
+
+		if( !indices ) {
+			// If the query uses "horizontal.vertical" format, convert to
+			// "horizontal/vertical" so that our URL parser can understand
+			if( /^\d+\.\d+$/.test( query ) ) {
+				query = query.replace( '.', '/' );
+			}
+
+			indices = this.Reveal.location.getIndicesFromHash( query, { oneBasedIndex: true } );
+		}
+
+		// Still no valid index? Fall back on a text search
+		if( !indices && /\S+/i.test( query ) && query.length > 1 ) {
+			indices = this.search( query );
+		}
+
+		if( indices && query !== '' ) {
+			this.Reveal.slide( indices.h, indices.v, indices.f );
+			return true;
+		}
+		else {
+			this.Reveal.slide( this.indicesOnShow.h, this.indicesOnShow.v, this.indicesOnShow.f );
+			return false;
+		}
+
+	}
+
+	jumpAfter( delay ) {
+
+		clearTimeout( this.jumpTimeout );
+		this.jumpTimeout = setTimeout( () => this.jump(), delay );
+
+	}
+
+	/**
+	 * A lofi search that looks for the given query in all
+	 * of our slides and returns the first match.
+	 */
+	search( query ) {
+
+		const regex = new RegExp( '\\b' + query.trim() + '\\b', 'i' );
+
+		const slide = this.Reveal.getSlides().find( ( slide ) => {
+			return regex.test( slide.innerText );
+		} );
+
+		if( slide ) {
+			return this.Reveal.getIndices( slide );
+		}
+		else {
+			return null;
+		}
+
+	}
+
+	/**
+	 * Reverts back to the slide we were on when jump to slide was
+	 * invoked.
+	 */
+	cancel() {
+
+		this.Reveal.slide( this.indicesOnShow.h, this.indicesOnShow.v, this.indicesOnShow.f );
+		this.hide();
+
+	}
+
+	confirm() {
+
+		this.jump();
+		this.hide();
+
+	}
+
+	destroy() {
+
+		this.jumpInput.removeEventListener( 'input', this.onInput );
+		this.jumpInput.removeEventListener( 'keydown', this.onKeyDown );
+		this.jumpInput.removeEventListener( 'blur', this.onBlur );
+
+		this.element.remove();
+
+	}
+
+	onKeyDown( event ) {
+
+		if( event.keyCode === 13 ) {
+			this.confirm();
+		}
+		else if( event.keyCode === 27 ) {
+			this.cancel();
+
+			event.stopImmediatePropagation();
+		}
+
+	}
+
+	onInput( event ) {
+
+		this.jumpAfter( 200 );
+
+	}
+
+	onBlur() {
+
+		setTimeout( () => this.hide(), 1 );
+
+	}
+
+}

js/controllers/keyboard.js

@@ -17,7 +17,6 @@ export default class Keyboard {
 		this.bindings = {};
 
 		this.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );
-		this.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );
 
 	}
 
@@ -32,17 +31,18 @@ export default class Keyboard {
 		}
 		else {
 			this.shortcuts['N  ,  SPACE']   = 'Next slide';
-			this.shortcuts['P']             = 'Previous slide';
+			this.shortcuts['P  ,  Shift SPACE']             = 'Previous slide';
 			this.shortcuts['←  ,  H'] = 'Navigate left';
 			this.shortcuts['→  ,  L'] = 'Navigate right';
 			this.shortcuts['↑  ,  K'] = 'Navigate up';
 			this.shortcuts['↓  ,  J'] = 'Navigate down';
 		}
 
-		this.shortcuts['Home  ,  Shift ←']        = 'First slide';
-		this.shortcuts['End  ,  Shift →']         = 'Last slide';
+		this.shortcuts['Alt + ←/&#8593/→/↓']        = 'Navigate without fragments';
+		this.shortcuts['Shift + ←/&#8593/→/↓']      = 'Jump to first/last slide';
 		this.shortcuts['B  ,  .']                       = 'Pause';
 		this.shortcuts['F']                             = 'Fullscreen';
+		this.shortcuts['G']                             = 'Jump to slide';
 		this.shortcuts['ESC, O']                        = 'Slide overview';
 
 	}
@@ -53,7 +53,6 @@ export default class Keyboard {
 	bind() {
 
 		document.addEventListener( 'keydown', this.onDocumentKeyDown, false );
-		document.addEventListener( 'keypress', this.onDocumentKeyPress, false );
 
 	}
 
@@ -63,7 +62,6 @@ export default class Keyboard {
 	unbind() {
 
 		document.removeEventListener( 'keydown', this.onDocumentKeyDown, false );
-		document.removeEventListener( 'keypress', this.onDocumentKeyPress, false );
 
 	}
 
@@ -134,20 +132,6 @@ export default class Keyboard {
 
 	}
 
-	/**
-	 * Handler for the document level 'keypress' event.
-	 *
-	 * @param {object} event
-	 */
-	onDocumentKeyPress( event ) {
-
-		// Check if the pressed key is question mark
-		if( event.shiftKey && event.charCode === 63 ) {
-			this.Reveal.toggleHelp();
-		}
-
-	}
-
 	/**
 	 * Handler for the document level 'keydown' event.
 	 *
@@ -182,13 +166,11 @@ export default class Keyboard {
 		let activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
 		let activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
 
-		// Whitelist specific modified + keycode combinations
-		let prevSlideShortcut = event.shiftKey && event.keyCode === 32;
-		let firstSlideShortcut = event.shiftKey && keyCode === 37;
-		let lastSlideShortcut = event.shiftKey && keyCode === 39;
+		// Whitelist certain modifiers for slide navigation shortcuts
+		let keyCodeUsesModifier = [32, 37, 38, 39, 40, 63, 78, 80, 191].indexOf( event.keyCode ) !== -1;
 
 		// Prevent all other events when a modifier is pressed
-		let unusedModifier = 	!prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
+		let unusedModifier = 	!( keyCodeUsesModifier && event.shiftKey || event.altKey ) &&
 								( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
 
 		// Disregard the event if there's a focused element or a
@@ -196,7 +178,7 @@ export default class Keyboard {
 		if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
 
 		// While paused only allow resume keyboard events; 'b', 'v', '.'
-		let resumeKeyCodes = [66,86,190,191];
+		let resumeKeyCodes = [66,86,190,191,112];
 		let key;
 
 		// Custom key bindings for togglePause should be able to resume
@@ -208,6 +190,10 @@ export default class Keyboard {
 			}
 		}
 
+		if( this.Reveal.isOverlayOpen() && !['Escape', 'f', 'c'].includes(event.key) ) {
+			return false;
+		}
+
 		if( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
 			return false;
 		}
@@ -277,52 +263,68 @@ export default class Keyboard {
 
 			// P, PAGE UP
 			if( keyCode === 80 || keyCode === 33 ) {
-				this.Reveal.prev();
+				this.Reveal.prev({skipFragments: event.altKey});
 			}
 			// N, PAGE DOWN
 			else if( keyCode === 78 || keyCode === 34 ) {
-				this.Reveal.next();
+				this.Reveal.next({skipFragments: event.altKey});
 			}
 			// H, LEFT
 			else if( keyCode === 72 || keyCode === 37 ) {
-				if( firstSlideShortcut ) {
+				if( event.shiftKey ) {
 					this.Reveal.slide( 0 );
 				}
 				else if( !this.Reveal.overview.isActive() && useLinearMode ) {
-					this.Reveal.prev();
+					if( config.rtl ) {
+						this.Reveal.next({skipFragments: event.altKey});
+					}
+					else {
+						this.Reveal.prev({skipFragments: event.altKey});
+					}
 				}
 				else {
-					this.Reveal.left();
+					this.Reveal.left({skipFragments: event.altKey});
 				}
 			}
 			// L, RIGHT
 			else if( keyCode === 76 || keyCode === 39 ) {
-				if( lastSlideShortcut ) {
-					this.Reveal.slide( Number.MAX_VALUE );
+				if( event.shiftKey ) {
+					this.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );
 				}
 				else if( !this.Reveal.overview.isActive() && useLinearMode ) {
-					this.Reveal.next();
+					if( config.rtl ) {
+						this.Reveal.prev({skipFragments: event.altKey});
+					}
+					else {
+						this.Reveal.next({skipFragments: event.altKey});
+					}
 				}
 				else {
-					this.Reveal.right();
+					this.Reveal.right({skipFragments: event.altKey});
 				}
 			}
 			// K, UP
 			else if( keyCode === 75 || keyCode === 38 ) {
-				if( !this.Reveal.overview.isActive() && useLinearMode ) {
-					this.Reveal.prev();
+				if( event.shiftKey ) {
+					this.Reveal.slide( undefined, 0 );
+				}
+				else if( !this.Reveal.overview.isActive() && useLinearMode ) {
+					this.Reveal.prev({skipFragments: event.altKey});
 				}
 				else {
-					this.Reveal.up();
+					this.Reveal.up({skipFragments: event.altKey});
 				}
 			}
 			// J, DOWN
 			else if( keyCode === 74 || keyCode === 40 ) {
-				if( !this.Reveal.overview.isActive() && useLinearMode ) {
-					this.Reveal.next();
+				if( event.shiftKey ) {
+					this.Reveal.slide( undefined, Number.MAX_VALUE );
+				}
+				else if( !this.Reveal.overview.isActive() && useLinearMode ) {
+					this.Reveal.next({skipFragments: event.altKey});
 				}
 				else {
-					this.Reveal.down();
+					this.Reveal.down({skipFragments: event.altKey});
 				}
 			}
 			// HOME
@@ -331,7 +333,7 @@ export default class Keyboard {
 			}
 			// END
 			else if( keyCode === 35 ) {
-				this.Reveal.slide( Number.MAX_VALUE );
+				this.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );
 			}
 			// SPACE
 			else if( keyCode === 32 ) {
@@ -339,14 +341,14 @@ export default class Keyboard {
 					this.Reveal.overview.deactivate();
 				}
 				if( event.shiftKey ) {
-					this.Reveal.prev();
+					this.Reveal.prev({skipFragments: event.altKey});
 				}
 				else {
-					this.Reveal.next();
+					this.Reveal.next({skipFragments: event.altKey});
 				}
 			}
 			// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
-			else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
+			else if( [58, 59, 66, 86, 190].includes( keyCode ) || ( keyCode === 191 && !event.shiftKey ) ) {
 				this.Reveal.togglePause();
 			}
 			// F
@@ -355,10 +357,28 @@ export default class Keyboard {
 			}
 			// A
 			else if( keyCode === 65 ) {
-				if ( config.autoSlideStoppable ) {
+				if( config.autoSlideStoppable ) {
 					this.Reveal.toggleAutoSlide( autoSlideWasPaused );
 				}
 			}
+			// G
+			else if( keyCode === 71 ) {
+				if( config.jumpToSlide ) {
+					this.Reveal.toggleJumpToSlide();
+				}
+			}
+			// C
+			else if( keyCode === 67 && this.Reveal.isOverlayOpen() ) {
+				this.Reveal.closeOverlay();
+			}
+			// ?
+			else if( ( keyCode === 63 || keyCode === 191 ) && event.shiftKey ) {
+				this.Reveal.toggleHelp();
+			}
+			// F1
+			else if( keyCode === 112 ) {
+				this.Reveal.toggleHelp();
+			}
 			else {
 				triggered = false;
 			}
@@ -385,4 +405,4 @@ export default class Keyboard {
 
 	}
 
-}
+}

js/controllers/location.js

@@ -1,10 +1,12 @@
-import { supportsHistoryAPI } from '../utils/device.js'
-
 /**
  * Reads and writes the URL based on reveal.js' current state.
  */
 export default class Location {
 
+	// The minimum number of milliseconds that must pass between
+	// calls to history.replaceState
+	MAX_REPLACE_STATE_FREQUENCY = 1000
+
 	constructor( Reveal ) {
 
 		this.Reveal = Reveal;
@@ -12,6 +14,8 @@ export default class Location {
 		// Delays updates to the URL due to a Chrome thumbnailer bug
 		this.writeURLTimeout = 0;
 
+		this.replaceStateTimestamp = 0;
+
 		this.onWindowHashChange = this.onWindowHashChange.bind( this );
 
 	}
@@ -29,24 +33,23 @@ export default class Location {
 	}
 
 	/**
-	 * Reads the current URL (hash) and navigates accordingly.
+	 * Returns the slide indices for the given hash link.
+	 *
+	 * @param {string} [hash] the hash string that we want to
+	 * find the indices for
+	 *
+	 * @returns slide indices or null
 	 */
-	readURL() {
-
-		let config = this.Reveal.getConfig();
-		let indices = this.Reveal.getIndices();
-		let currentSlide = this.Reveal.getCurrentSlide();
-
-		let hash = window.location.hash;
+	getIndicesFromHash( hash=window.location.hash, options={} ) {
 
 		// Attempt to parse the hash as either an index or name
-		let bits = hash.slice( 2 ).split( '/' ),
-			name = hash.replace( /#\/?/gi, '' );
+		let name = hash.replace( /^#\/?/, '' );
+		let bits = name.split( '/' );
 
 		// If the first bit is not fully numeric and there is a name we
 		// can assume that this is a named link
 		if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
-			let element;
+			let slide;
 
 			let f;
 
@@ -59,28 +62,19 @@ export default class Location {
 
 			// Ensure the named link is a valid HTML ID attribute
 			try {
-				element = document.getElementById( decodeURIComponent( name ) );
+				slide = document
+					.getElementById( decodeURIComponent( name ) )
+					.closest('.slides section');
 			}
 			catch ( error ) { }
 
-			// Ensure that we're not already on a slide with the same name
-			let isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
-
-			if( element ) {
-				// If the slide exists and is not the current slide...
-				if ( !isSameNameAsCurrentSlide || typeof f !== 'undefined' ) {
-					// ...find the position of the named slide and navigate to it
-					let slideIndices = this.Reveal.getIndices( element );
-					this.Reveal.slide( slideIndices.h, slideIndices.v, f );
-				}
-			}
-			// If the slide doesn't exist, navigate to the current slide
-			else {
-				this.Reveal.slide( indices.h || 0, indices.v || 0 );
+			if( slide ) {
+				return { ...this.Reveal.getIndices( slide ), f };
 			}
 		}
 		else {
-			let hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
+			const config = this.Reveal.getConfig();
+			let hashIndexBase = config.hashOneBasedIndex || options.oneBasedIndex ? 1 : 0;
 
 			// Read the index components of the hash
 			let h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
@@ -94,10 +88,32 @@ export default class Location {
 				}
 			}
 
-			if( h !== indices.h || v !== indices.v || f !== undefined ) {
-				this.Reveal.slide( h, v, f );
+			return { h, v, f };
+		}
+
+		// The hash couldn't be parsed or no matching named link was found
+		return null
+
+	}
+
+	/**
+	 * Reads the current URL (hash) and navigates accordingly.
+	 */
+	readURL() {
+
+		const currentIndices = this.Reveal.getIndices();
+		const newIndices = this.getIndicesFromHash();
+
+		if( newIndices ) {
+			if( ( newIndices.h !== currentIndices.h || newIndices.v !== currentIndices.v || newIndices.f !== undefined ) ) {
+					this.Reveal.slide( newIndices.h, newIndices.v, newIndices.f );
 			}
 		}
+		// If no new indices are available, we're trying to navigate to
+		// a slide hash that does not exist
+		else {
+			this.Reveal.slide( currentIndices.h || 0, currentIndices.v || 0 );
+		}
 
 	}
 
@@ -121,15 +137,24 @@ export default class Location {
 			this.writeURLTimeout = setTimeout( this.writeURL, delay );
 		}
 		else if( currentSlide ) {
+
+			let hash = this.getHash();
+
 			// If we're configured to push to history OR the history
-			// API is not avaialble.
-			if( config.history || supportsHistoryAPI === false ) {
-				window.location.hash = this.getHash();
+			// API is not available.
+			if( config.history ) {
+				window.location.hash = hash;
 			}
 			// If we're configured to reflect the current slide in the
 			// URL without pushing to history.
 			else if( config.hash ) {
-				window.history.replaceState( null, null, '#' + this.getHash() );
+				// If the hash is empty, don't add it to the URL
+				if( hash === '/' ) {
+					this.debouncedReplaceState( window.location.pathname + window.location.search );
+				}
+				else {
+					this.debouncedReplaceState( '#' + hash );
+				}
 			}
 			// UPDATE: The below nuking of all hash changes breaks
 			// anchors on pages where reveal.js is running. Removed
@@ -141,6 +166,27 @@ export default class Location {
 			// else {
 			// 	window.history.replaceState( null, null, window.location.pathname + window.location.search );
 			// }
+
+		}
+
+	}
+
+	replaceState( url ) {
+
+		window.history.replaceState( null, null, url );
+		this.replaceStateTimestamp = Date.now();
+
+	}
+
+	debouncedReplaceState( url ) {
+
+		clearTimeout( this.replaceStateTimeout );
+
+		if( Date.now() - this.replaceStateTimestamp > this.MAX_REPLACE_STATE_FREQUENCY ) {
+			this.replaceState( url );
+		}
+		else {
+			this.replaceStateTimeout = setTimeout( () => this.replaceState( url ), this.MAX_REPLACE_STATE_FREQUENCY );
 		}
 
 	}

js/controllers/notes.js

@@ -1,5 +1,5 @@
 /**
- * Handles the showing and 
+ * Handles the showing of speaker notes
  */
 export default class Notes {
 
@@ -38,10 +38,12 @@ export default class Notes {
 	 */
 	update() {
 
-		if( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {
-
+		if( this.Reveal.getConfig().showNotes &&
+			this.element && this.Reveal.getCurrentSlide() &&
+			!this.Reveal.isScrollView() &&
+			!this.Reveal.isPrintView()
+		) {
 			this.element.innerHTML = this.getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
-
 		}
 
 	}
@@ -54,7 +56,11 @@ export default class Notes {
 	 */
 	updateVisibility() {
 
-		if( this.Reveal.getConfig().showNotes && this.hasNotes() ) {
+		if( this.Reveal.getConfig().showNotes &&
+			this.hasNotes() &&
+			!this.Reveal.isScrollView() &&
+			!this.Reveal.isPrintView()
+		) {
 			this.Reveal.getRevealElement().classList.add( 'show-notes' );
 		}
 		else {
@@ -89,7 +95,7 @@ export default class Notes {
 	 * Retrieves the speaker notes from a slide. Notes can be
 	 * defined in two ways:
 	 * 1. As a data-notes attribute on the slide <section>
-	 * 2. As an <aside class="notes"> inside of the slide
+	 * 2. With <aside class="notes"> elements inside the slide
 	 *
 	 * @param {HTMLElement} [slide=currentSlide]
 	 * @return {(string|null)}
@@ -101,14 +107,20 @@ export default class Notes {
 			return slide.getAttribute( 'data-notes' );
 		}
 
-		// ... or using an <aside class="notes"> element
-		let notesElement = slide.querySelector( 'aside.notes' );
-		if( notesElement ) {
-			return notesElement.innerHTML;
+		// ... or using <aside class="notes"> elements
+		let notesElements = slide.querySelectorAll( 'aside.notes' );
+		if( notesElements ) {
+			return Array.from(notesElements).map( notesElement => notesElement.innerHTML ).join( '\n' );
 		}
 
 		return null;
 
 	}
 
+	destroy() {
+
+		this.element.remove();
+
+	}
+
 }

js/controllers/overlay.js

@@ -0,0 +1,366 @@
+/**
+ * Handles the display of reveal.js' overlay elements used
+ * to preview iframes, images & videos.
+ */
+
+export default class Overlay {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.onSlidesClicked = this.onSlidesClicked.bind( this );
+
+		this.linkPreviewSelector = null;
+		this.mediaPreviewSelector = '[data-preview-image], [data-preview-video]';
+
+		this.state = {};
+
+	}
+
+	update() {
+
+		// Enable link previews globally
+		if( this.Reveal.getConfig().previewLinks ) {
+			this.linkPreviewSelector = 'a[href]:not([data-preview-link=false]), [data-preview-link]:not(a):not([data-preview-link=false])';
+		}
+		// Enable link previews for individual elements
+		else {
+			this.linkPreviewSelector = '[data-preview-link]:not([data-preview-link=false])';
+		}
+
+		this.hasLinkPreviews = this.Reveal.getSlidesElement().querySelectorAll( this.linkPreviewSelector ).length > 0;
+		this.hasMediaPreviews = this.Reveal.getSlidesElement().querySelectorAll( this.mediaPreviewSelector ).length > 0;
+
+		// Only add the listener when there are previewable elements in the slides
+		if( this.hasLinkPreviews || this.hasMediaPreviews ) {
+			this.Reveal.getSlidesElement().addEventListener( 'click', this.onSlidesClicked, false );
+		}
+		else {
+			this.Reveal.getSlidesElement().removeEventListener( 'click', this.onSlidesClicked, false );
+		}
+
+	}
+
+	createOverlay( className ) {
+
+		this.dom = document.createElement( 'div' );
+		this.dom.classList.add( 'r-overlay' );
+		this.dom.classList.add( className );
+
+		this.viewport = document.createElement( 'div' );
+		this.viewport.classList.add( 'r-overlay-viewport' );
+
+		this.dom.appendChild( this.viewport );
+		this.Reveal.getRevealElement().appendChild( this.dom );
+
+	}
+
+	/**
+	 * Opens a preview window for the target URL.
+	 *
+	 * @param {string} url - url for preview iframe src
+	 */
+	showIframePreview( url ) {
+
+		this.close();
+
+		this.state.previewIframe = url;
+
+		this.createOverlay( 'r-overlay-preview' );
+		this.dom.dataset.state = 'loading';
+
+		this.viewport.innerHTML =
+			`<header class="r-overlay-header">
+				<a class="r-overlay-button r-overlay-external" href="${url}" target="_blank"><span class="icon"></span></a>
+				<button class="r-overlay-button r-overlay-close"><span class="icon"></span></button>
+			</header>
+			<div class="r-overlay-spinner"></div>
+			<div class="r-overlay-content">
+				<iframe src="${url}"></iframe>
+				<small class="r-overlay-content-inner">
+					<span class="r-overlay-error x-frame-error">Unable to load iframe. This is likely due to the site's policy (x-frame-options).</span>
+				</small>
+			</div>`;
+
+		this.dom.querySelector( 'iframe' ).addEventListener( 'load', event => {
+			this.dom.dataset.state = 'loaded';
+		}, false );
+
+		this.dom.querySelector( '.r-overlay-close' ).addEventListener( 'click', event => {
+			this.close();
+			event.preventDefault();
+		}, false );
+
+		this.dom.querySelector( '.r-overlay-external' ).addEventListener( 'click', event => {
+			this.close();
+		}, false );
+
+		this.Reveal.dispatchEvent({ type: 'showiframepreview', data: { url } });
+
+	}
+
+	/**
+	 * Opens a preview window that provides a larger view of the
+	 * given image/video.
+	 *
+	 * @param {string} url - url to the image/video to preview
+	 * @param {image|video} mediaType
+	 * @param {HTMLElement} [trigger] - the element that triggered
+	 * the preview
+	 */
+	showMediaPreview( url, mediaType, trigger ) {
+
+		if( mediaType !== 'image' && mediaType !== 'video' ) {
+			console.warn( 'Please specify a valid media type to preview (image|video)' );
+			return;
+		}
+
+		this.close();
+
+		const fitMode = trigger ? trigger.dataset.previewFit || 'scale-down' : 'scale-down';
+
+		this.createOverlay( 'r-overlay-preview' );
+		this.dom.dataset.state = 'loading';
+		this.dom.dataset.previewFit = fitMode;
+
+		this.viewport.innerHTML =
+			`<header class="r-overlay-header">
+				<button class="r-overlay-button r-overlay-close">Esc <span class="icon"></span></button>
+			</header>
+			<div class="r-overlay-spinner"></div>
+			<div class="r-overlay-content"></div>`;
+
+		const contentElement = this.dom.querySelector( '.r-overlay-content' );
+
+		if( mediaType === 'image' ) {
+
+			this.state = { previewImage: url, previewFit: fitMode }
+
+			const img = document.createElement( 'img', {} );
+			img.src = url;
+			contentElement.appendChild( img );
+
+			img.addEventListener( 'load', () => {
+				this.dom.dataset.state = 'loaded';
+			}, false );
+
+			img.addEventListener( 'error', () => {
+				this.dom.dataset.state = 'error';
+				contentElement.innerHTML =
+						`<span class="r-overlay-error">Unable to load image.</span>`
+			}, false );
+
+			// Hide image overlays when clicking outside the overlay
+			this.dom.style.cursor = 'zoom-out';
+			this.dom.addEventListener( 'click', ( event ) => {
+				this.close();
+			}, false );
+
+		}
+		else if( mediaType === 'video' ) {
+
+			this.state = { previewVideo: url, previewFit: fitMode }
+
+			const video = document.createElement( 'video' );
+			video.autoplay = this.dom.dataset.previewAutoplay === 'false' ? false : true;
+			video.controls = this.dom.dataset.previewControls === 'false' ? false : true;
+			video.loop = this.dom.dataset.previewLoop === 'true' ? true : false;
+			video.muted = this.dom.dataset.previewMuted === 'true' ? true : false;
+			video.playsInline = true;
+			video.src = url;
+			contentElement.appendChild( video );
+
+			video.addEventListener( 'loadeddata', () => {
+				this.dom.dataset.state = 'loaded';
+			}, false );
+
+			video.addEventListener( 'error', () => {
+				this.dom.dataset.state = 'error';
+				contentElement.innerHTML =
+					`<span class="r-overlay-error">Unable to load video.</span>`;
+			}, false );
+
+		}
+		else {
+			throw new Error( 'Please specify a valid media type to preview' );
+		}
+
+		this.dom.querySelector( '.r-overlay-close' ).addEventListener( 'click', ( event ) => {
+			this.close();
+			event.preventDefault();
+		}, false );
+
+		this.Reveal.dispatchEvent({ type: 'showmediapreview', data: { mediaType, url, trigger } });
+
+	}
+
+	/**
+	 * Open or close help overlay window.
+	 *
+	 * @param {Boolean} [override] Flag which overrides the
+	 * toggle logic and forcibly sets the desired state. True means
+	 * help is open, false means it's closed.
+	 */
+	toggleHelp( override ) {
+
+		if( typeof override === 'boolean' ) {
+			override ? this.showHelp() : this.close();
+		}
+		else {
+			if( this.dom ) {
+				this.close();
+			}
+			else {
+				this.showHelp();
+			}
+		}
+	}
+
+	/**
+	 * Opens an overlay window with help material.
+	 */
+	showHelp() {
+
+		if( this.Reveal.getConfig().help ) {
+
+			this.close();
+
+			this.createOverlay( 'r-overlay-help' );
+
+			let html = '<p class="title">Keyboard Shortcuts</p>';
+
+			let shortcuts = this.Reveal.keyboard.getShortcuts(),
+				bindings = this.Reveal.keyboard.getBindings();
+
+			html += '<table><th>KEY</th><th>ACTION</th>';
+			for( let key in shortcuts ) {
+				html += `<tr><td>${key}</td><td>${shortcuts[ key ]}</td></tr>`;
+			}
+
+			// Add custom key bindings that have associated descriptions
+			for( let binding in bindings ) {
+				if( bindings[binding].key && bindings[binding].description ) {
+					html += `<tr><td>${bindings[binding].key}</td><td>${bindings[binding].description}</td></tr>`;
+				}
+			}
+
+			html += '</table>';
+
+			this.viewport.innerHTML = `
+				<header class="r-overlay-header">
+					<button class="r-overlay-button r-overlay-close">Esc <span class="icon"></span></button>
+				</header>
+				<div class="r-overlay-content">
+					<div class="r-overlay-help-content">${html}</div>
+				</div>
+			`;
+
+			this.dom.querySelector( '.r-overlay-close' ).addEventListener( 'click', event => {
+				this.close();
+				event.preventDefault();
+			}, false );
+
+			this.Reveal.dispatchEvent({ type: 'showhelp' });
+
+		}
+
+	}
+
+	isOpen() {
+
+		return !!this.dom;
+
+	}
+
+	/**
+	 * Closes any currently open overlay.
+	 */
+	close() {
+
+		if( this.dom ) {
+			this.dom.remove();
+			this.dom = null;
+
+			this.state = {};
+
+			this.Reveal.dispatchEvent({ type: 'closeoverlay' });
+
+			return true;
+		}
+
+		return false;
+
+	}
+
+	getState() {
+
+		return this.state;
+
+	}
+
+	setState( state ) {
+
+		if( state.previewIframe ) {
+			this.showIframePreview( state.previewIframe );
+		}
+		else if( state.previewImage ) {
+			this.showMediaPreview( state.previewImage, 'image' );
+		}
+		else if( state.previewVideo ) {
+			this.showMediaPreview( state.previewVideo, 'video' );
+		}
+		else {
+			this.close();
+		}
+
+	}
+
+	onSlidesClicked( event ) {
+
+		const target = event.target;
+
+		const linkTarget = target.closest( this.linkPreviewSelector );
+		const mediaTarget = target.closest( this.mediaPreviewSelector );
+
+		// Was a link preview clicked?
+		if( linkTarget ) {
+			let url = linkTarget.getAttribute( 'href' ) || linkTarget.getAttribute( 'data-preview-link' );
+			if( url ) {
+				this.showIframePreview( url );
+				event.preventDefault();
+			}
+		}
+		// Was a media preview clicked?
+		else if( mediaTarget ) {
+			if( mediaTarget.hasAttribute( 'data-preview-image' ) ) {
+				let url = mediaTarget.dataset.previewImage || mediaTarget.getAttribute( 'src' );
+				if( url ) {
+					this.showMediaPreview( url, 'image', mediaTarget );
+					event.preventDefault();
+				}
+			}
+			else if( mediaTarget.hasAttribute( 'data-preview-video' ) ) {
+				let url = mediaTarget.dataset.previewVideo || mediaTarget.getAttribute( 'src' );
+				if( !url ) {
+					let source = mediaTarget.querySelector( 'source' );
+					if( source ) {
+						url = source.getAttribute( 'src' );
+					}
+				}
+				if( url ) {
+					this.showMediaPreview( url, 'video', mediaTarget );
+					event.preventDefault();
+				}
+			}
+		}
+
+	}
+
+	destroy() {
+
+		this.close();
+
+	}
+
+}

js/controllers/overview.js

@@ -24,7 +24,7 @@ export default class Overview {
 	activate() {
 
 		// Only proceed if enabled in config
-		if( this.Reveal.getConfig().overview && !this.isActive() ) {
+		if( this.Reveal.getConfig().overview && !this.Reveal.isScrollView() && !this.isActive() ) {
 
 			this.active = true;
 

js/controllers/plugins.js

@@ -12,7 +12,7 @@ export default class Plugins {
 		// Flags our current state (idle -> loading -> loaded)
 		this.state = 'idle';
 
-		// An id:instance map of currently registed plugins
+		// An id:instance map of currently registered plugins
 		this.registeredPlugins = {};
 
 		this.asyncDependencies = [];
@@ -171,7 +171,7 @@ export default class Plugins {
 	/**
 	 * Registers a new plugin with this reveal.js instance.
 	 *
-	 * reveal.js waits for all regisered plugins to initialize
+	 * reveal.js waits for all registered plugins to initialize
 	 * before considering itself ready, as long as the plugin
 	 * is registered before calling `Reveal.initialize()`.
 	 */
@@ -238,4 +238,17 @@ export default class Plugins {
 
 	}
 
+	destroy() {
+
+		Object.values( this.registeredPlugins ).forEach( plugin => {
+			if( typeof plugin.destroy === 'function' ) {
+				plugin.destroy();
+			}
+		} );
+
+		this.registeredPlugins = {};
+		this.asyncDependencies = [];
+
+	}
+
 }

js/controllers/pointer.js

@@ -27,12 +27,10 @@ export default class Pointer {
 	configure( config, oldConfig ) {
 
 		if( config.mouseWheel ) {
-			document.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
-			document.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
+			document.addEventListener( 'wheel', this.onDocumentMouseScroll, false );
 		}
 		else {
-			document.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
-			document.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
+			document.removeEventListener( 'wheel', this.onDocumentMouseScroll, false );
 		}
 
 		// Auto-hide the mouse pointer when its inactive
@@ -75,6 +73,16 @@ export default class Pointer {
 
 	}
 
+	destroy() {
+
+		this.showCursor();
+
+		document.removeEventListener( 'wheel', this.onDocumentMouseScroll, false );
+		document.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );
+		document.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );
+
+	}
+
 	/**
 	 * Called whenever there is mouse input at the document level
 	 * to determine if the cursor is active or not.
@@ -115,4 +123,4 @@ export default class Pointer {
 
 	}
 
-}
+}

js/controllers/printview.js

@@ -4,7 +4,7 @@ import { queryAll, createStyleSheet } from '../utils/util.js'
 /**
  * Setups up our presentation for printing/exporting to PDF.
  */
-export default class Print {
+export default class PrintView {
 
 	constructor( Reveal ) {
 
@@ -16,50 +16,69 @@ export default class Print {
 	 * Configures the presentation for printing to a static
 	 * PDF.
 	 */
-	setupPDF() {
+	async activate() {
 
-		let config = this.Reveal.getConfig();
+		const config = this.Reveal.getConfig();
+		const slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )
 
-		let slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
+		// Compute slide numbers now, before we start duplicating slides
+		const injectPageNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
+
+		const slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
 
 		// Dimensions of the PDF pages
-		let pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
+		const pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
 			pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
 
 		// Dimensions of slides within the pages
-		let slideWidth = slideSize.width,
+		const slideWidth = slideSize.width,
 			slideHeight = slideSize.height;
 
+		await new Promise( requestAnimationFrame );
+
 		// Let the browser know what page size we want to print
 		createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
 
 		// Limit the size of certain elements to the dimensions of the slide
 		createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
 
-		document.documentElement.classList.add( 'print-pdf' );
+		document.documentElement.classList.add( 'reveal-print', 'print-pdf' );
 		document.body.style.width = pageWidth + 'px';
 		document.body.style.height = pageHeight + 'px';
 
+		const viewportElement = this.Reveal.getViewportElement();
+		let presentationBackground;
+		if( viewportElement ) {
+			const viewportStyles = window.getComputedStyle( viewportElement );
+			if( viewportStyles && viewportStyles.background ) {
+				presentationBackground = viewportStyles.background;
+			}
+		}
+
 		// Make sure stretch elements fit on slide
+		await new Promise( requestAnimationFrame );
 		this.Reveal.layoutSlideContents( slideWidth, slideHeight );
 
-		// Compute slide numbers now, before we start duplicating slides
-		let doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
-		queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( function( slide ) {
-			slide.setAttribute( 'data-slide-number', this.Reveal.slideNumber.getSlideNumber( slide ) );
-		}, this );
+		// Batch scrollHeight access to prevent layout thrashing
+		await new Promise( requestAnimationFrame );
+
+		const slideScrollHeights = slides.map( slide => slide.scrollHeight );
+
+		const pages = [];
+		const pageContainer = slides[0].parentNode;
+		let slideNumber = 1;
 
 		// Slide and slide background layout
-		queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( function( slide ) {
+		slides.forEach( function( slide, index ) {
 
 			// Vertical stacks are not centred since their section
 			// children will be
 			if( slide.classList.contains( 'stack' ) === false ) {
 				// Center the slide inside of the page, giving the slide some margin
-				let left = ( pageWidth - slideWidth ) / 2,
-					top = ( pageHeight - slideHeight ) / 2;
+				let left = ( pageWidth - slideWidth ) / 2;
+				let top = ( pageHeight - slideHeight ) / 2;
 
-				let contentHeight = slide.scrollHeight;
+				const contentHeight = slideScrollHeights[ index ];
 				let numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
 
 				// Adhere to configured pages per slide limit
@@ -72,10 +91,18 @@ export default class Print {
 
 				// Wrap the slide in a page element and hide its overflow
 				// so that no page ever flows onto another
-				let page = document.createElement( 'div' );
+				const page = document.createElement( 'div' );
+				pages.push( page );
+
 				page.className = 'pdf-page';
 				page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
-				slide.parentNode.insertBefore( page, slide );
+
+				// Copy the presentation-wide background to each individual
+				// page when printing
+				if( presentationBackground ) {
+					page.style.background = presentationBackground;
+				}
+
 				page.appendChild( slide );
 
 				// Position the slide inside of the page
@@ -83,6 +110,8 @@ export default class Print {
 				slide.style.top = top + 'px';
 				slide.style.width = slideWidth + 'px';
 
+				this.Reveal.slideContent.layout( slide );
+
 				if( slide.slideBackgroundElement ) {
 					page.insertBefore( slide.slideBackgroundElement, slide );
 				}
@@ -91,19 +120,19 @@ export default class Print {
 				if( config.showNotes ) {
 
 					// Are there notes for this slide?
-					let notes = getSlideNotes( slide );
+					const notes = this.Reveal.getSlideNotes( slide );
 					if( notes ) {
 
-						let notesSpacing = 8;
-						let notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
-						let notesElement = document.createElement( 'div' );
+						const notesSpacing = 8;
+						const notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
+						const notesElement = document.createElement( 'div' );
 						notesElement.classList.add( 'speaker-notes' );
 						notesElement.classList.add( 'speaker-notes-pdf' );
 						notesElement.setAttribute( 'data-layout', notesLayout );
 						notesElement.innerHTML = notes;
 
 						if( notesLayout === 'separate-page' ) {
-							page.parentNode.insertBefore( notesElement, page.nextSibling );
+							pages.push( notesElement );
 						}
 						else {
 							notesElement.style.left = notesSpacing + 'px';
@@ -116,12 +145,12 @@ export default class Print {
 
 				}
 
-				// Inject slide numbers if `slideNumbers` are enabled
-				if( doingSlideNumbers ) {
-					let numberElement = document.createElement( 'div' );
+				// Inject page numbers if `slideNumbers` are enabled
+				if( injectPageNumbers ) {
+					const numberElement = document.createElement( 'div' );
 					numberElement.classList.add( 'slide-number' );
 					numberElement.classList.add( 'slide-number-pdf' );
-					numberElement.innerHTML = slide.getAttribute( 'data-slide-number' );
+					numberElement.innerHTML = slideNumber++;
 					page.appendChild( numberElement );
 				}
 
@@ -131,12 +160,11 @@ export default class Print {
 					// Each fragment 'group' is an array containing one or more
 					// fragments. Multiple fragments that appear at the same time
 					// are part of the same group.
-					let fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
+					const fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
 
 					let previousFragmentStep;
-					let previousPage;
 
-					fragmentGroups.forEach( function( fragments ) {
+					fragmentGroups.forEach( function( fragments, index ) {
 
 						// Remove 'current-fragment' from the previous group
 						if( previousFragmentStep ) {
@@ -151,11 +179,18 @@ export default class Print {
 						}, this );
 
 						// Create a separate page for the current fragment state
-						let clonedPage = page.cloneNode( true );
-						page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
+						const clonedPage = page.cloneNode( true );
+
+						// Inject unique page numbers for fragments
+						if( injectPageNumbers ) {
+							const numberElement = clonedPage.querySelector( '.slide-number-pdf' );
+							const fragmentNumber = index + 1;
+							numberElement.innerHTML += '.' + fragmentNumber;
+						}
+
+						pages.push( clonedPage );
 
 						previousFragmentStep = fragments;
-						previousPage = clonedPage;
 
 					}, this );
 
@@ -178,17 +213,26 @@ export default class Print {
 
 		}, this );
 
+		await new Promise( requestAnimationFrame );
+
+		pages.forEach( page => pageContainer.appendChild( page ) );
+
+		// Re-run JS-based content layout after the slide is added to page DOM
+		this.Reveal.slideContent.layout( this.Reveal.getSlidesElement() );
+
 		// Notify subscribers that the PDF layout is good to go
 		this.Reveal.dispatchEvent({ type: 'pdf-ready' });
 
+		viewportElement.classList.remove( 'loading-scroll-mode' );
+
 	}
 
 	/**
-	 * Checks if this instance is being used to print a PDF.
+	 * Checks if the print mode is/should be activated.
 	 */
-	isPrintingPDF() {
+	isActive() {
 
-		return ( /print-pdf/gi ).test( window.location.search );
+		return this.Reveal.getConfig().view === 'print';
 
 	}
 

js/controllers/progress.js

@@ -55,7 +55,14 @@ export default class Progress {
 		// Update progress if enabled
 		if( this.Reveal.getConfig().progress && this.bar ) {
 
-			this.bar.style.width = this.Reveal.getProgress() * this.getMaxWidth() + 'px';
+			let scale = this.Reveal.getProgress();
+
+			// Don't fill the progress bar if there's only one slide
+			if( this.Reveal.getTotalSlides() < 2 ) {
+				scale = 0;
+			}
+
+			this.bar.style.transform = 'scaleX('+ scale +')';
 
 		}
 
@@ -81,16 +88,23 @@ export default class Progress {
 
 		event.preventDefault();
 
-		let slidesTotal = this.Reveal.getHorizontalSlides().length;
+		let slides = this.Reveal.getSlides();
+		let slidesTotal = slides.length;
 		let slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );
 
 		if( this.Reveal.getConfig().rtl ) {
 			slideIndex = slidesTotal - slideIndex;
 		}
 
-		this.Reveal.slide( slideIndex );
+		let targetIndices = this.Reveal.getIndices(slides[slideIndex]);
+		this.Reveal.slide( targetIndices.h, targetIndices.v );
 
 	}
 
+	destroy() {
+
+		this.element.remove();
+
+	}
 
 }

js/controllers/scrollview.js

@@ -0,0 +1,923 @@
+import { HORIZONTAL_SLIDES_SELECTOR, HORIZONTAL_BACKGROUNDS_SELECTOR } from '../utils/constants.js'
+import { queryAll } from '../utils/util.js'
+
+const HIDE_SCROLLBAR_TIMEOUT = 500;
+const MAX_PROGRESS_SPACING = 4;
+const MIN_PROGRESS_SEGMENT_HEIGHT = 6;
+const MIN_PLAYHEAD_HEIGHT = 8;
+
+/**
+ * The scroll view lets you read a reveal.js presentation
+ * as a linear scrollable page.
+ */
+export default class ScrollView {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.active = false;
+		this.activatedCallbacks = [];
+
+		this.onScroll = this.onScroll.bind( this );
+
+	}
+
+	/**
+	 * Activates the scroll view. This rearranges the presentation DOM
+	 * by—among other things—wrapping each slide in a page element.
+	 */
+	activate() {
+
+		if( this.active ) return;
+
+		const stateBeforeActivation = this.Reveal.getState();
+
+		this.active = true;
+
+		// Store the full presentation HTML so that we can restore it
+		// when/if the scroll view is deactivated
+		this.slideHTMLBeforeActivation = this.Reveal.getSlidesElement().innerHTML;
+
+		const horizontalSlides = queryAll( this.Reveal.getRevealElement(), HORIZONTAL_SLIDES_SELECTOR );
+		const horizontalBackgrounds = queryAll( this.Reveal.getRevealElement(), HORIZONTAL_BACKGROUNDS_SELECTOR );
+
+		this.viewportElement.classList.add( 'loading-scroll-mode', 'reveal-scroll' );
+
+		let presentationBackground;
+
+		const viewportStyles = window.getComputedStyle( this.viewportElement );
+		if( viewportStyles && viewportStyles.background ) {
+			presentationBackground = viewportStyles.background;
+		}
+
+		const pageElements = [];
+		const pageContainer = horizontalSlides[0].parentNode;
+
+		let previousSlide;
+
+		// Creates a new page element and appends the given slide/bg
+		// to it.
+		const createPageElement = ( slide, h, v, isVertical ) => {
+
+			let contentContainer;
+
+			// If this slide is part of an auto-animation sequence, we
+			// group it under the same page element as the previous slide
+			if( previousSlide && this.Reveal.shouldAutoAnimateBetween( previousSlide, slide ) ) {
+				contentContainer = document.createElement( 'div' );
+				contentContainer.className = 'scroll-page-content scroll-auto-animate-page';
+				contentContainer.style.display = 'none';
+				previousSlide.closest( '.scroll-page-content' ).parentNode.appendChild( contentContainer );
+			}
+			else {
+				// Wrap the slide in a page element and hide its overflow
+				// so that no page ever flows onto another
+				const page = document.createElement( 'div' );
+				page.className = 'scroll-page';
+				pageElements.push( page );
+
+				// This transfers over the background of the vertical stack containing
+				// the slide if it exists. Otherwise, it uses the presentation-wide
+				// background.
+				if( isVertical && horizontalBackgrounds.length > h ) {
+					const slideBackground = horizontalBackgrounds[h];
+					const pageBackground = window.getComputedStyle( slideBackground );
+
+					if( pageBackground && pageBackground.background ) {
+						page.style.background = pageBackground.background;
+					}
+					else if( presentationBackground ) {
+						page.style.background = presentationBackground;
+					}
+				} else if( presentationBackground ) {
+					page.style.background = presentationBackground;
+				}
+
+				const stickyContainer = document.createElement( 'div' );
+				stickyContainer.className = 'scroll-page-sticky';
+				page.appendChild( stickyContainer );
+
+				contentContainer = document.createElement( 'div' );
+				contentContainer.className = 'scroll-page-content';
+				stickyContainer.appendChild( contentContainer );
+			}
+
+			contentContainer.appendChild( slide );
+
+			slide.classList.remove( 'past', 'future' );
+			slide.setAttribute( 'data-index-h', h );
+			slide.setAttribute( 'data-index-v', v );
+
+			if( slide.slideBackgroundElement ) {
+				slide.slideBackgroundElement.remove( 'past', 'future' );
+				contentContainer.insertBefore( slide.slideBackgroundElement, slide );
+			}
+
+			previousSlide = slide;
+
+		}
+
+		// Slide and slide background layout
+		horizontalSlides.forEach( ( horizontalSlide, h ) => {
+
+			if( this.Reveal.isVerticalStack( horizontalSlide ) ) {
+				horizontalSlide.querySelectorAll( 'section' ).forEach( ( verticalSlide, v ) => {
+					createPageElement( verticalSlide, h, v, true );
+				});
+			}
+			else {
+				createPageElement( horizontalSlide, h, 0 );
+			}
+
+		}, this );
+
+		this.createProgressBar();
+
+		// Remove leftover stacks
+		queryAll( this.Reveal.getRevealElement(), '.stack' ).forEach( stack => stack.remove() );
+
+		// Add our newly created pages to the DOM
+		pageElements.forEach( page => pageContainer.appendChild( page ) );
+
+		// Re-run JS-based content layout after the slide is added to page DOM
+		this.Reveal.slideContent.layout( this.Reveal.getSlidesElement() );
+
+		this.Reveal.layout();
+		this.Reveal.setState( stateBeforeActivation );
+
+		this.activatedCallbacks.forEach( callback => callback() );
+		this.activatedCallbacks = [];
+
+		this.restoreScrollPosition();
+
+		this.viewportElement.classList.remove( 'loading-scroll-mode' );
+		this.viewportElement.addEventListener( 'scroll', this.onScroll, { passive: true } );
+
+	}
+
+	/**
+	 * Deactivates the scroll view and restores the standard slide-based
+	 * presentation.
+	 */
+	deactivate() {
+
+		if( !this.active ) return;
+
+		const stateBeforeDeactivation = this.Reveal.getState();
+
+		this.active = false;
+
+		this.viewportElement.removeEventListener( 'scroll', this.onScroll );
+		this.viewportElement.classList.remove( 'reveal-scroll' );
+
+		this.removeProgressBar();
+
+		this.Reveal.getSlidesElement().innerHTML = this.slideHTMLBeforeActivation;
+		this.Reveal.sync();
+		this.Reveal.setState( stateBeforeDeactivation );
+
+		this.slideHTMLBeforeActivation = null;
+
+	}
+
+	toggle( override ) {
+
+		if( typeof override === 'boolean' ) {
+			override ? this.activate() : this.deactivate();
+		}
+		else {
+			this.isActive() ? this.deactivate() : this.activate();
+		}
+
+	}
+
+	/**
+	 * Checks if the scroll view is currently active.
+	 */
+	isActive() {
+
+		return this.active;
+
+	}
+
+	/**
+	 * Renders the progress bar component.
+	 */
+	createProgressBar() {
+
+		this.progressBar = document.createElement( 'div' );
+		this.progressBar.className = 'scrollbar';
+
+		this.progressBarInner = document.createElement( 'div' );
+		this.progressBarInner.className = 'scrollbar-inner';
+		this.progressBar.appendChild( this.progressBarInner );
+
+		this.progressBarPlayhead = document.createElement( 'div' );
+		this.progressBarPlayhead.className = 'scrollbar-playhead';
+		this.progressBarInner.appendChild( this.progressBarPlayhead );
+
+		this.viewportElement.insertBefore( this.progressBar, this.viewportElement.firstChild );
+
+		const handleDocumentMouseMove	= ( event ) => {
+
+			let progress = ( event.clientY - this.progressBarInner.getBoundingClientRect().top ) / this.progressBarHeight;
+			progress = Math.max( Math.min( progress, 1 ), 0 );
+
+			this.viewportElement.scrollTop = progress * ( this.viewportElement.scrollHeight - this.viewportElement.offsetHeight );
+
+		};
+
+		const handleDocumentMouseUp = ( event ) => {
+
+			this.draggingProgressBar = false;
+			this.showProgressBar();
+
+			document.removeEventListener( 'mousemove', handleDocumentMouseMove );
+			document.removeEventListener( 'mouseup', handleDocumentMouseUp );
+
+		};
+
+		const handleMouseDown = ( event ) => {
+
+			event.preventDefault();
+
+			this.draggingProgressBar = true;
+
+			document.addEventListener( 'mousemove', handleDocumentMouseMove );
+			document.addEventListener( 'mouseup', handleDocumentMouseUp );
+
+			handleDocumentMouseMove( event );
+
+		};
+
+		this.progressBarInner.addEventListener( 'mousedown', handleMouseDown );
+
+	}
+
+	removeProgressBar() {
+
+		if( this.progressBar ) {
+			this.progressBar.remove();
+			this.progressBar = null;
+		}
+
+	}
+
+	layout() {
+
+		if( this.isActive() ) {
+			this.syncPages();
+			this.syncScrollPosition();
+		}
+
+	}
+
+	/**
+	 * Updates our pages to match the latest configuration and
+	 * presentation size.
+	 */
+	syncPages() {
+
+		const config = this.Reveal.getConfig();
+
+		const slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
+		const scale = this.Reveal.getScale();
+		const useCompactLayout = config.scrollLayout === 'compact';
+
+		const viewportHeight = this.viewportElement.offsetHeight;
+		const compactHeight = slideSize.height * scale;
+		const pageHeight = useCompactLayout ? compactHeight : viewportHeight;
+
+		// The height that needs to be scrolled between scroll triggers
+		this.scrollTriggerHeight = useCompactLayout ? compactHeight : viewportHeight;
+
+		this.viewportElement.style.setProperty( '--page-height', pageHeight + 'px' );
+		this.viewportElement.style.scrollSnapType = typeof config.scrollSnap === 'string' ? `y ${config.scrollSnap}` : '';
+
+		// This will hold all scroll triggers used to show/hide slides
+		this.slideTriggers = [];
+
+		const pageElements = Array.from( this.Reveal.getRevealElement().querySelectorAll( '.scroll-page' ) );
+
+		this.pages = pageElements.map( pageElement => {
+			const page = this.createPage({
+				pageElement,
+				slideElement: pageElement.querySelector( 'section' ),
+				stickyElement: pageElement.querySelector( '.scroll-page-sticky' ),
+				contentElement: pageElement.querySelector( '.scroll-page-content' ),
+				backgroundElement: pageElement.querySelector( '.slide-background' ),
+				autoAnimateElements: pageElement.querySelectorAll( '.scroll-auto-animate-page' ),
+				autoAnimatePages: []
+			});
+
+			page.pageElement.style.setProperty( '--slide-height', config.center === true ? 'auto' : slideSize.height + 'px' );
+
+			this.slideTriggers.push({
+				page: page,
+				activate: () => this.activatePage( page ),
+				deactivate: () => this.deactivatePage( page )
+			});
+
+			// Create scroll triggers that show/hide fragments
+			this.createFragmentTriggersForPage( page );
+
+			// Create scroll triggers for triggering auto-animate steps
+			if( page.autoAnimateElements.length > 0 ) {
+				this.createAutoAnimateTriggersForPage( page );
+			}
+
+			let totalScrollTriggerCount = Math.max( page.scrollTriggers.length - 1, 0 );
+
+			// Each auto-animate step may include its own scroll triggers
+			// for fragments, ensure we count those as well
+			totalScrollTriggerCount += page.autoAnimatePages.reduce( ( total, page ) => {
+				return total + Math.max( page.scrollTriggers.length - 1, 0 );
+			}, page.autoAnimatePages.length );
+
+			// Clean up from previous renders
+			page.pageElement.querySelectorAll( '.scroll-snap-point' ).forEach( el => el.remove() );
+
+			// Create snap points for all scroll triggers
+			// - Can't be absolute in FF
+			// - Can't be 0-height in Safari
+			// - Can't use snap-align on parent in Safari because then
+			//   inner triggers won't work
+			for( let i = 0; i < totalScrollTriggerCount + 1; i++ ) {
+				const triggerStick = document.createElement( 'div' );
+				triggerStick.className = 'scroll-snap-point';
+				triggerStick.style.height = this.scrollTriggerHeight + 'px';
+				triggerStick.style.scrollSnapAlign = useCompactLayout ? 'center' : 'start';
+				page.pageElement.appendChild( triggerStick );
+
+				if( i === 0 ) {
+					triggerStick.style.marginTop = -this.scrollTriggerHeight + 'px';
+				}
+			}
+
+			// In the compact layout, only slides with scroll triggers cover the
+			// full viewport height. This helps avoid empty gaps before or after
+			// a sticky slide.
+			if( useCompactLayout && page.scrollTriggers.length > 0 ) {
+				page.pageHeight = viewportHeight;
+				page.pageElement.style.setProperty( '--page-height', viewportHeight + 'px' );
+			}
+			else {
+				page.pageHeight = pageHeight;
+				page.pageElement.style.removeProperty( '--page-height' );
+			}
+
+			// Add scroll padding based on how many scroll triggers we have
+			page.scrollPadding = this.scrollTriggerHeight * totalScrollTriggerCount;
+
+			// The total height including scrollable space
+			page.totalHeight = page.pageHeight + page.scrollPadding;
+
+			// This is used to pad the height of our page in CSS
+			page.pageElement.style.setProperty( '--page-scroll-padding', page.scrollPadding + 'px' );
+
+			// If this is a sticky page, stick it to the vertical center
+			if( totalScrollTriggerCount > 0 ) {
+				page.stickyElement.style.position = 'sticky';
+				page.stickyElement.style.top = Math.max( ( viewportHeight - page.pageHeight ) / 2, 0 ) + 'px';
+			}
+			else {
+				page.stickyElement.style.position = 'relative';
+				page.pageElement.style.scrollSnapAlign = page.pageHeight < viewportHeight ? 'center' : 'start';
+			}
+
+			return page;
+		} );
+
+		this.setTriggerRanges();
+
+		/*
+		console.log(this.slideTriggers.map( t => {
+			return {
+				range: `${t.range[0].toFixed(2)}-${t.range[1].toFixed(2)}`,
+				triggers: t.page.scrollTriggers.map( t => {
+					return `${t.range[0].toFixed(2)}-${t.range[1].toFixed(2)}`
+				}).join( ', ' ),
+			}
+		}))
+		*/
+
+		this.viewportElement.setAttribute( 'data-scrollbar', config.scrollProgress );
+
+		if( config.scrollProgress && this.totalScrollTriggerCount > 1 ) {
+			// Create the progress bar if it doesn't already exist
+			if( !this.progressBar ) this.createProgressBar();
+
+			this.syncProgressBar();
+		}
+		else {
+			this.removeProgressBar();
+		}
+
+	}
+
+	/**
+	 * Calculates and sets the scroll range for all of our scroll
+	 * triggers.
+	 */
+	setTriggerRanges() {
+
+		// Calculate the total number of scroll triggers
+		this.totalScrollTriggerCount = this.slideTriggers.reduce( ( total, trigger ) => {
+			return total + Math.max( trigger.page.scrollTriggers.length, 1 );
+		}, 0 );
+
+		let rangeStart = 0;
+
+		// Calculate the scroll range of each scroll trigger on a scale
+		// of 0-1
+		this.slideTriggers.forEach( ( trigger, i ) => {
+			trigger.range = [
+				rangeStart,
+				rangeStart + Math.max( trigger.page.scrollTriggers.length, 1 ) / this.totalScrollTriggerCount
+			];
+
+			const scrollTriggerSegmentSize = ( trigger.range[1] - trigger.range[0] ) / trigger.page.scrollTriggers.length;
+			// Set the range for each inner scroll trigger
+			trigger.page.scrollTriggers.forEach( ( scrollTrigger, i ) => {
+				scrollTrigger.range = [
+					rangeStart + i * scrollTriggerSegmentSize,
+					rangeStart + ( i + 1 ) * scrollTriggerSegmentSize
+				];
+			} );
+
+			rangeStart = trigger.range[1];
+		} );
+
+		// Ensure the last trigger extends to the end of the page, otherwise
+		// rounding errors can cause the last trigger to end at 0.999999...
+		this.slideTriggers[this.slideTriggers.length - 1].range[1] = 1;
+
+	}
+
+	/**
+	 * Creates one scroll trigger for each fragments in the given page.
+	 *
+	 * @param {*} page
+	 */
+	createFragmentTriggersForPage( page, slideElement ) {
+
+		slideElement = slideElement || page.slideElement;
+
+		// Each fragment 'group' is an array containing one or more
+		// fragments. Multiple fragments that appear at the same time
+		// are part of the same group.
+		const fragmentGroups = this.Reveal.fragments.sort( slideElement.querySelectorAll( '.fragment' ), true );
+
+		// Create scroll triggers that show/hide fragments
+		if( fragmentGroups.length ) {
+			page.fragments = this.Reveal.fragments.sort( slideElement.querySelectorAll( '.fragment:not(.disabled)' ) );
+			page.scrollTriggers.push(
+				// Trigger for the initial state with no fragments visible
+				{
+					activate: () => {
+						this.Reveal.fragments.update( -1, page.fragments, slideElement );
+					}
+				}
+			);
+
+			// Triggers for each fragment group
+			fragmentGroups.forEach( ( fragments, i ) => {
+				page.scrollTriggers.push({
+					activate: () => {
+						this.Reveal.fragments.update( i, page.fragments, slideElement );
+					}
+				});
+			} );
+		}
+
+
+		return page.scrollTriggers.length;
+
+	}
+
+	/**
+	 * Creates scroll triggers for the auto-animate steps in the
+	 * given page.
+	 *
+	 * @param {*} page
+	 */
+	createAutoAnimateTriggersForPage( page ) {
+
+		if( page.autoAnimateElements.length > 0 ) {
+
+			// Triggers for each subsequent auto-animate slide
+			this.slideTriggers.push( ...Array.from( page.autoAnimateElements ).map( ( autoAnimateElement, i ) => {
+				let autoAnimatePage = this.createPage({
+					slideElement: autoAnimateElement.querySelector( 'section' ),
+					contentElement: autoAnimateElement,
+					backgroundElement: autoAnimateElement.querySelector( '.slide-background' )
+				});
+
+				// Create fragment scroll triggers for the auto-animate slide
+				this.createFragmentTriggersForPage( autoAnimatePage, autoAnimatePage.slideElement );
+
+				page.autoAnimatePages.push( autoAnimatePage );
+
+				// Return our slide trigger
+				return {
+					page: autoAnimatePage,
+					activate: () => this.activatePage( autoAnimatePage ),
+					deactivate: () => this.deactivatePage( autoAnimatePage )
+				};
+			}));
+		}
+
+	}
+
+	/**
+	 * Helper method for creating a page definition and adding
+	 * required fields. A "page" is a slide or auto-animate step.
+	 */
+	createPage( page ) {
+
+		page.scrollTriggers = [];
+		page.indexh = parseInt( page.slideElement.getAttribute( 'data-index-h' ), 10 );
+		page.indexv = parseInt( page.slideElement.getAttribute( 'data-index-v' ), 10 );
+
+		return page;
+
+	}
+
+	/**
+	 * Rerenders progress bar segments so that they match the current
+	 * reveal.js config and size.
+	 */
+	syncProgressBar() {
+
+		this.progressBarInner.querySelectorAll( '.scrollbar-slide' ).forEach( slide => slide.remove() );
+
+		const scrollHeight = this.viewportElement.scrollHeight;
+		const viewportHeight = this.viewportElement.offsetHeight;
+		const viewportHeightFactor = viewportHeight / scrollHeight;
+
+		this.progressBarHeight = this.progressBarInner.offsetHeight;
+		this.playheadHeight = Math.max( viewportHeightFactor * this.progressBarHeight, MIN_PLAYHEAD_HEIGHT );
+		this.progressBarScrollableHeight = this.progressBarHeight - this.playheadHeight;
+
+		const progressSegmentHeight = viewportHeight / scrollHeight * this.progressBarHeight;
+		const spacing = Math.min( progressSegmentHeight / 8, MAX_PROGRESS_SPACING );
+
+		this.progressBarPlayhead.style.height = this.playheadHeight - spacing + 'px';
+
+		// Don't show individual segments if they're too small
+		if( progressSegmentHeight > MIN_PROGRESS_SEGMENT_HEIGHT ) {
+
+			this.slideTriggers.forEach( slideTrigger => {
+
+				const { page } = slideTrigger;
+
+				// Visual representation of a slide
+				page.progressBarSlide = document.createElement( 'div' );
+				page.progressBarSlide.className = 'scrollbar-slide';
+				page.progressBarSlide.style.top = slideTrigger.range[0] * this.progressBarHeight + 'px';
+				page.progressBarSlide.style.height = ( slideTrigger.range[1] - slideTrigger.range[0] ) * this.progressBarHeight - spacing + 'px';
+				page.progressBarSlide.classList.toggle( 'has-triggers', page.scrollTriggers.length > 0 );
+				this.progressBarInner.appendChild( page.progressBarSlide );
+
+				// Visual representations of each scroll trigger
+				page.scrollTriggerElements = page.scrollTriggers.map( ( trigger, i ) => {
+
+					const triggerElement = document.createElement( 'div' );
+					triggerElement.className = 'scrollbar-trigger';
+					triggerElement.style.top = ( trigger.range[0] - slideTrigger.range[0] ) * this.progressBarHeight + 'px';
+					triggerElement.style.height = ( trigger.range[1] - trigger.range[0] ) * this.progressBarHeight - spacing + 'px';
+					page.progressBarSlide.appendChild( triggerElement );
+
+					if( i === 0 ) triggerElement.style.display = 'none';
+
+					return triggerElement;
+
+				} );
+
+			} );
+
+		}
+		else {
+
+			this.pages.forEach( page => page.progressBarSlide = null );
+
+		}
+
+	}
+
+	/**
+	 * Reads the current scroll position and updates our active
+	 * trigger states accordingly.
+	 */
+	syncScrollPosition() {
+
+		const viewportHeight = this.viewportElement.offsetHeight;
+		const viewportHeightFactor = viewportHeight / this.viewportElement.scrollHeight;
+
+		const scrollTop = this.viewportElement.scrollTop;
+		const scrollHeight = this.viewportElement.scrollHeight - viewportHeight
+		const scrollProgress = Math.max( Math.min( scrollTop / scrollHeight, 1 ), 0 );
+		const scrollProgressMid = Math.max( Math.min( ( scrollTop + viewportHeight / 2 ) / this.viewportElement.scrollHeight, 1 ), 0 );
+
+		let activePage;
+
+		this.slideTriggers.forEach( ( trigger ) => {
+			const { page } = trigger;
+
+			const shouldPreload = scrollProgress >= trigger.range[0] - viewportHeightFactor*2 &&
+														scrollProgress <= trigger.range[1] + viewportHeightFactor*2;
+
+			// Load slides that are within the preload range
+			if( shouldPreload && !page.loaded ) {
+				page.loaded = true;
+				this.Reveal.slideContent.load( page.slideElement );
+			}
+			else if( page.loaded ) {
+				page.loaded = false;
+				this.Reveal.slideContent.unload( page.slideElement );
+			}
+
+			// If we're within this trigger range, activate it
+			if( scrollProgress >= trigger.range[0] && scrollProgress <= trigger.range[1] ) {
+				this.activateTrigger( trigger );
+				activePage = trigger.page;
+			}
+			// .. otherwise deactivate
+			else if( trigger.active ) {
+				this.deactivateTrigger( trigger );
+			}
+		} );
+
+		// Each page can have its own scroll triggers, check if any of those
+		// need to be activated/deactivated
+		if( activePage ) {
+			activePage.scrollTriggers.forEach( ( trigger ) => {
+				if( scrollProgressMid >= trigger.range[0] && scrollProgressMid <= trigger.range[1] ) {
+					this.activateTrigger( trigger );
+				}
+				else if( trigger.active ) {
+					this.deactivateTrigger( trigger );
+				}
+			} );
+		}
+
+		// Update our visual progress indication
+		this.setProgressBarValue( scrollTop / ( this.viewportElement.scrollHeight - viewportHeight ) );
+
+	}
+
+	/**
+	 * Moves the progress bar playhead to the specified position.
+	 *
+	 * @param {number} progress 0-1
+	 */
+	setProgressBarValue( progress ) {
+
+		if( this.progressBar ) {
+
+			this.progressBarPlayhead.style.transform = `translateY(${progress * this.progressBarScrollableHeight}px)`;
+
+			this.getAllPages()
+				.filter( page => page.progressBarSlide )
+				.forEach( ( page ) => {
+					page.progressBarSlide.classList.toggle( 'active', page.active === true );
+
+					page.scrollTriggers.forEach( ( trigger, i ) => {
+						page.scrollTriggerElements[i].classList.toggle( 'active', page.active === true && trigger.active === true );
+					} );
+				} );
+
+			this.showProgressBar();
+
+		}
+
+	}
+
+	/**
+	 * Show the progress bar and, if configured, automatically hide
+	 * it after a delay.
+	 */
+	showProgressBar() {
+
+		this.progressBar.classList.add( 'visible' );
+
+		clearTimeout( this.hideProgressBarTimeout );
+
+		if( this.Reveal.getConfig().scrollProgress === 'auto' && !this.draggingProgressBar ) {
+
+			this.hideProgressBarTimeout = setTimeout( () => {
+				if( this.progressBar ) {
+					this.progressBar.classList.remove( 'visible' );
+				}
+			}, HIDE_SCROLLBAR_TIMEOUT );
+
+		}
+
+	}
+
+	/**
+	 * Scroll to the previous page.
+	 */
+	prev() {
+
+		this.viewportElement.scrollTop -= this.scrollTriggerHeight;
+
+	}
+
+	/**
+	 * Scroll to the next page.
+	 */
+	next() {
+
+		this.viewportElement.scrollTop += this.scrollTriggerHeight;
+
+	}
+
+	/**
+	 * Scrolls the given slide element into view.
+	 *
+	 * @param {HTMLElement} slideElement
+	 */
+	scrollToSlide( slideElement ) {
+
+		// If the scroll view isn't active yet, queue this action
+		if( !this.active ) {
+			this.activatedCallbacks.push( () => this.scrollToSlide( slideElement ) );
+		}
+		else {
+			// Find the trigger for this slide
+			const trigger = this.getScrollTriggerBySlide( slideElement );
+
+			if( trigger ) {
+				// Use the trigger's range to calculate the scroll position
+				this.viewportElement.scrollTop = trigger.range[0] * ( this.viewportElement.scrollHeight - this.viewportElement.offsetHeight );
+			}
+		}
+
+	}
+
+	/**
+	 * Persists the current scroll position to session storage
+	 * so that it can be restored.
+	 */
+	storeScrollPosition() {
+
+		clearTimeout( this.storeScrollPositionTimeout );
+
+		this.storeScrollPositionTimeout = setTimeout( () => {
+			sessionStorage.setItem( 'reveal-scroll-top', this.viewportElement.scrollTop );
+			sessionStorage.setItem( 'reveal-scroll-origin', location.origin + location.pathname );
+
+			this.storeScrollPositionTimeout = null;
+		}, 50 );
+
+	}
+
+	/**
+	 * Restores the scroll position when a deck is reloader.
+	 */
+	restoreScrollPosition() {
+
+		const scrollPosition = sessionStorage.getItem( 'reveal-scroll-top' );
+		const scrollOrigin = sessionStorage.getItem( 'reveal-scroll-origin' );
+
+		if( scrollPosition && scrollOrigin === location.origin + location.pathname ) {
+			this.viewportElement.scrollTop = parseInt( scrollPosition, 10 );
+		}
+
+	}
+
+	/**
+	 * Activates the given page and starts its embedded content
+	 * if there is any.
+	 *
+	 * @param {object} page
+	 */
+	activatePage( page ) {
+
+		if( !page.active ) {
+
+			page.active = true;
+
+			const { slideElement, backgroundElement, contentElement, indexh, indexv } = page;
+
+			contentElement.style.display = 'block';
+
+			slideElement.classList.add( 'present' );
+
+			if( backgroundElement ) {
+				backgroundElement.classList.add( 'present' );
+			}
+
+			this.Reveal.setCurrentScrollPage( slideElement, indexh, indexv );
+			this.Reveal.backgrounds.bubbleSlideContrastClassToElement( slideElement, this.viewportElement );
+
+			// If this page is part of an auto-animation there will be one
+			// content element per auto-animated page. We need to show the
+			// current page and hide all others.
+			Array.from( contentElement.parentNode.querySelectorAll( '.scroll-page-content' ) ).forEach( sibling => {
+				if( sibling !== contentElement ) {
+					sibling.style.display = 'none';
+				}
+			});
+
+		}
+
+	}
+
+	/**
+	 * Deactivates the page after it has been visible.
+	 *
+	 * @param {object} page
+	 */
+	deactivatePage( page ) {
+
+		if( page.active ) {
+
+			page.active = false;
+			if( page.slideElement ) page.slideElement.classList.remove( 'present' );
+			if( page.backgroundElement ) page.backgroundElement.classList.remove( 'present' );
+
+		}
+
+	}
+
+	activateTrigger( trigger ) {
+
+		if( !trigger.active ) {
+			trigger.active = true;
+			trigger.activate();
+		}
+
+	}
+
+	deactivateTrigger( trigger ) {
+
+		if( trigger.active ) {
+			trigger.active = false;
+
+			if( trigger.deactivate ) {
+				trigger.deactivate();
+			}
+		}
+
+	}
+
+	/**
+	 * Retrieve a slide by its original h/v index (i.e. the indices the
+	 * slide had before being linearized).
+	 *
+	 * @param {number} h
+	 * @param {number} v
+	 * @returns {HTMLElement}
+	 */
+	getSlideByIndices( h, v ) {
+
+		const page = this.getAllPages().find( page => {
+			return page.indexh === h && page.indexv === v;
+		} );
+
+		return page ? page.slideElement : null;
+
+	}
+
+	/**
+	 * Retrieve a list of all scroll triggers for the given slide
+	 * DOM element.
+	 *
+	 * @param {HTMLElement} slide
+	 * @returns {Array}
+	 */
+	getScrollTriggerBySlide( slide ) {
+
+		return this.slideTriggers.find( trigger => trigger.page.slideElement === slide );
+
+	}
+
+	/**
+	 * Get a list of all pages in the scroll view. This includes
+	 * both top-level slides and auto-animate steps.
+	 *
+	 * @returns {Array}
+	 */
+	getAllPages() {
+
+		return this.pages.flatMap( page => [page, ...(page.autoAnimatePages || [])] );
+
+	}
+
+	onScroll() {
+
+		this.syncScrollPosition();
+		this.storeScrollPosition();
+
+	}
+
+	get viewportElement() {
+
+		return this.Reveal.getViewportElement();
+
+	}
+
+}

js/controllers/slidecontent.js

@@ -1,7 +1,8 @@
-import { HORIZONTAL_SLIDES_SELECTOR, VERTICAL_SLIDES_SELECTOR } from '../utils/constants.js'
-import { extend, queryAll, closestParent } from '../utils/util.js'
+import { extend, queryAll, closest, getMimeTypeFromFile, encodeRFC3986URI } from '../utils/util.js'
 import { isMobile } from '../utils/device.js'
 
+import fitty from 'fitty';
+
 /**
  * Handles loading, unloading and playback of slide
  * content such as images, videos and iframes.
@@ -24,6 +25,10 @@ export default class SlideContent {
 	 */
 	shouldPreload( element ) {
 
+		if( this.Reveal.isScrollView() ) {
+			return true;
+		}
+
 		// Prefer an explicit global preload setting
 		let preload = this.Reveal.getConfig().preloadIframes;
 
@@ -68,6 +73,11 @@ export default class SlideContent {
 				sources += 1;
 			} );
 
+			// Enable inline video playback in mobile Safari
+			if( isMobile && media.tagName === 'VIDEO' ) {
+				media.setAttribute( 'playsinline', '' );
+			}
+
 			// If we rewrote sources for this video/audio element, we need
 			// to manually tell it to load from its new origin
 			if( sources > 0 ) {
@@ -95,32 +105,52 @@ export default class SlideContent {
 
 				// Images
 				if( backgroundImage ) {
-					backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
+					// base64
+					if(  /^data:/.test( backgroundImage.trim() ) ) {
+						backgroundContent.style.backgroundImage = `url(${backgroundImage.trim()})`;
+					}
+					// URL(s)
+					else {
+						backgroundContent.style.backgroundImage = backgroundImage.split( ',' ).map( background => {
+							// Decode URL(s) that are already encoded first
+							let decoded = decodeURI(background.trim());
+							return `url(${encodeRFC3986URI(decoded)})`;
+						}).join( ',' );
+					}
 				}
 				// Videos
-				else if ( backgroundVideo && !this.Reveal.isSpeakerNotes() ) {
+				else if ( backgroundVideo ) {
 					let video = document.createElement( 'video' );
 
 					if( backgroundVideoLoop ) {
 						video.setAttribute( 'loop', '' );
 					}
 
-					if( backgroundVideoMuted ) {
+					if( backgroundVideoMuted || this.Reveal.isSpeakerNotes() ) {
 						video.muted = true;
 					}
 
-					// Inline video playback works (at least in Mobile Safari) as
-					// long as the video is muted and the `playsinline` attribute is
-					// present
+					// Enable inline playback in mobile Safari
+					//
+					// Mute is required for video to play when using
+					// swipe gestures to navigate since they don't
+					// count as direct user actions :'(
 					if( isMobile ) {
 						video.muted = true;
-						video.autoplay = true;
 						video.setAttribute( 'playsinline', '' );
 					}
 
 					// Support comma separated lists of video sources
 					backgroundVideo.split( ',' ).forEach( source => {
-						video.innerHTML += '<source src="'+ source +'">';
+						const sourceElement = document.createElement( 'source' );
+						sourceElement.setAttribute( 'src', source );
+
+						let type = getMimeTypeFromFile( source );
+						if( type ) {
+							sourceElement.setAttribute( 'type', type );
+						}
+
+						video.appendChild( sourceElement );
 					} );
 
 					backgroundContent.appendChild( video );
@@ -159,6 +189,27 @@ export default class SlideContent {
 
 		}
 
+		this.layout( slide );
+
+	}
+
+	/**
+	 * Applies JS-dependent layout helpers for the scope.
+	 */
+	layout( scopeElement ) {
+
+		// Autosize text with the r-fit-text class based on the
+		// size of its container. This needs to happen after the
+		// slide is visible in order to measure the text.
+		Array.from( scopeElement.querySelectorAll( '.r-fit-text' ) ).forEach( element => {
+			fitty( element, {
+				minSize: 24,
+				maxSize: this.Reveal.getConfig().height * 0.8,
+				observeMutations: false,
+				observeWindow: false
+			} );
+		} );
+
 	}
 
 	/**
@@ -229,7 +280,9 @@ export default class SlideContent {
 	 */
 	startEmbeddedContent( element ) {
 
-		if( element && !this.Reveal.isSpeakerNotes() ) {
+		if( element ) {
+
+			const isSpeakerNotesWindow = this.Reveal.isSpeakerNotes();
 
 			// Restart GIFs
 			queryAll( element, 'img[src$=".gif"]' ).forEach( el => {
@@ -240,7 +293,7 @@ export default class SlideContent {
 
 			// HTML5 media elements
 			queryAll( element, 'video, audio' ).forEach( el => {
-				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
+				if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
 					return;
 				}
 
@@ -250,11 +303,14 @@ export default class SlideContent {
 				// If no global setting is available, fall back on the element's
 				// own autoplay setting
 				if( typeof autoplay !== 'boolean' ) {
-					autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
+					autoplay = el.hasAttribute( 'data-autoplay' ) || !!closest( el, '.slide-background' );
 				}
 
 				if( autoplay && typeof el.play === 'function' ) {
 
+					// In the speaker view we only auto-play muted media
+					if( isSpeakerNotesWindow && !el.muted ) return;
+
 					// If the media is ready, start playback
 					if( el.readyState > 1 ) {
 						this.startEmbeddedMedia( { target: el } );
@@ -286,27 +342,33 @@ export default class SlideContent {
 				}
 			} );
 
-			// Normal iframes
-			queryAll( element, 'iframe[src]' ).forEach( el => {
-				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
-					return;
-				}
+			// Don't play iframe content in the speaker view since we can't
+			// guarantee that it's muted
+			if( !isSpeakerNotesWindow ) {
 
-				this.startEmbeddedIframe( { target: el } );
-			} );
+				// Normal iframes
+				queryAll( element, 'iframe[src]' ).forEach( el => {
+					if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
+						return;
+					}
 
-			// Lazy loading iframes
-			queryAll( element, 'iframe[data-src]' ).forEach( el => {
-				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
-					return;
-				}
+					this.startEmbeddedIframe( { target: el } );
+				} );
 
-				if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
-					el.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes
-					el.addEventListener( 'load', this.startEmbeddedIframe );
-					el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
-				}
-			} );
+				// Lazy loading iframes
+				queryAll( element, 'iframe[data-src]' ).forEach( el => {
+					if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
+						return;
+					}
+
+					if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
+						el.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes
+						el.addEventListener( 'load', this.startEmbeddedIframe );
+						el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
+					}
+				} );
+
+			}
 
 		}
 
@@ -320,12 +382,15 @@ export default class SlideContent {
 	 */
 	startEmbeddedMedia( event ) {
 
-		let isAttachedToDOM = !!closestParent( event.target, 'html' ),
-			isVisible  		= !!closestParent( event.target, '.present' );
+		let isAttachedToDOM = !!closest( event.target, 'html' ),
+			isVisible  		= !!closest( event.target, '.present' );
 
 		if( isAttachedToDOM && isVisible ) {
-			event.target.currentTime = 0;
-			event.target.play();
+			// Don't restart if media is already playing
+			if( event.target.paused || event.target.ended ) {
+				event.target.currentTime = 0;
+				event.target.play();
+			}
 		}
 
 		event.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );
@@ -344,8 +409,8 @@ export default class SlideContent {
 
 		if( iframe && iframe.contentWindow ) {
 
-			let isAttachedToDOM = !!closestParent( event.target, 'html' ),
-				isVisible  		= !!closestParent( event.target, '.present' );
+			let isAttachedToDOM = !!closest( event.target, 'html' ),
+				isVisible  		= !!closest( event.target, '.present' );
 
 			if( isAttachedToDOM && isVisible ) {
 
@@ -355,7 +420,7 @@ export default class SlideContent {
 				// If no global setting is available, fall back on the element's
 				// own autoplay setting
 				if( typeof autoplay !== 'boolean' ) {
-					autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
+					autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closest( iframe, '.slide-background' );
 				}
 
 				// YouTube postMessage API
@@ -432,4 +497,4 @@ export default class SlideContent {
 
 	}
 
-}
+}

js/controllers/slidenumber.js

@@ -1,3 +1,10 @@
+import {
+	SLIDE_NUMBER_FORMAT_CURRENT,
+	SLIDE_NUMBER_FORMAT_CURRENT_SLASH_TOTAL,
+	SLIDE_NUMBER_FORMAT_HORIZONTAL_DOT_VERTICAL,
+	SLIDE_NUMBER_FORMAT_HORIZONTAL_SLASH_VERTICAL
+} from "../utils/constants";
+
 /**
  * Handles the display of reveal.js' optional slide number.
  */
@@ -23,7 +30,7 @@ export default class SlideNumber {
 	configure( config, oldConfig ) {
 
 		let slideNumberDisplay = 'none';
-		if( config.slideNumber && !this.Reveal.isPrintingPDF() ) {
+		if( config.slideNumber && !this.Reveal.isPrintView() ) {
 			if( config.showSlideNumber === 'all' ) {
 				slideNumberDisplay = 'block';
 			}
@@ -56,7 +63,7 @@ export default class SlideNumber {
 
 		let config = this.Reveal.getConfig();
 		let value;
-		let format = 'h.v';
+		let format = SLIDE_NUMBER_FORMAT_HORIZONTAL_DOT_VERTICAL;
 
 		if ( typeof config.slideNumber === 'function' ) {
 			value = config.slideNumber( slide );
@@ -69,21 +76,24 @@ export default class SlideNumber {
 			// If there are ONLY vertical slides in this deck, always use
 			// a flattened slide number
 			if( !/c/.test( format ) && this.Reveal.getHorizontalSlides().length === 1 ) {
-				format = 'c';
+				format = SLIDE_NUMBER_FORMAT_CURRENT;
 			}
 
+			// Offset the current slide number by 1 to make it 1-indexed
+			let horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;
+
 			value = [];
 			switch( format ) {
-				case 'c':
-					value.push( this.Reveal.getSlidePastCount( slide ) + 1 );
+				case SLIDE_NUMBER_FORMAT_CURRENT:
+					value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );
 					break;
-				case 'c/t':
-					value.push( this.Reveal.getSlidePastCount( slide ) + 1, '/', this.Reveal.getTotalSlides() );
+				case SLIDE_NUMBER_FORMAT_CURRENT_SLASH_TOTAL:
+					value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );
 					break;
 				default:
 					let indices = this.Reveal.getIndices( slide );
-					value.push( indices.h + 1 );
-					let sep = format === 'h/v' ? '/' : '.';
+					value.push( indices.h + horizontalOffset );
+					let sep = format === SLIDE_NUMBER_FORMAT_HORIZONTAL_SLASH_VERTICAL ? '/' : '.';
 					if( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );
 			}
 		}
@@ -120,4 +130,10 @@ export default class SlideNumber {
 
 	}
 
+	destroy() {
+
+		this.element.remove();
+
+	}
+
 }

js/controllers/touch.js

@@ -1,4 +1,5 @@
 import { isAndroid } from '../utils/device.js'
+import { matches } from '../utils/util.js'
 
 const SWIPE_THRESHOLD = 40;
 
@@ -82,6 +83,9 @@ export default class Touch {
 	 */
 	isSwipePrevented( target ) {
 
+		// Prevent accidental swipes when scrubbing timelines
+		if( matches( target, 'video[controls], audio[controls]' ) ) return true;
+
 		while( target && typeof target.hasAttribute === 'function' ) {
 			if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
 			target = target.parentNode;
@@ -99,6 +103,8 @@ export default class Touch {
 	 */
 	onTouchStart( event ) {
 
+		this.touchCaptured = false;
+
 		if( this.isSwipePrevented( event.target ) ) return true;
 
 		this.touchStartX = event.touches[0].clientX;

js/index.js

@@ -1,4 +1,4 @@
-import Deck from './reveal.js'
+import Deck, { VERSION } from './reveal.js'
 
 /**
  * Expose the Reveal class to the window. To create a
@@ -45,10 +45,14 @@ Reveal.initialize = options => {
  * queuing up premature API calls and invoking all
  * of them when Reveal.initialize is called.
  */
-[ 'on', 'off', 'addEventListener', 'removeEventListener', 'registerPlugin' ].forEach( method => {
+[ 'configure', 'on', 'off', 'addEventListener', 'removeEventListener', 'registerPlugin' ].forEach( method => {
 	Reveal[method] = ( ...args ) => {
 		enqueuedAPICalls.push( deck => deck[method].call( null, ...args ) );
 	}
 } );
 
+Reveal.isReady = () => false;
+
+Reveal.VERSION = VERSION;
+
 export default Reveal;

js/utils/color.js

@@ -29,9 +29,9 @@ export const colorToRgb = ( color ) => {
 	if( hex6 && hex6[1] ) {
 		hex6 = hex6[1];
 		return {
-			r: parseInt( hex6.substr( 0, 2 ), 16 ),
-			g: parseInt( hex6.substr( 2, 2 ), 16 ),
-			b: parseInt( hex6.substr( 4, 2 ), 16 )
+			r: parseInt( hex6.slice( 0, 2 ), 16 ),
+			g: parseInt( hex6.slice( 2, 4 ), 16 ),
+			b: parseInt( hex6.slice( 4, 6 ), 16 )
 		};
 	}
 
@@ -44,7 +44,7 @@ export const colorToRgb = ( color ) => {
 		};
 	}
 
-	let rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
+	let rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
 	if( rgba ) {
 		return {
 			r: parseInt( rgba[1], 10 ),

js/utils/constants.js

@@ -2,9 +2,16 @@
 export const SLIDES_SELECTOR = '.slides section';
 export const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';
 export const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';
+export const HORIZONTAL_BACKGROUNDS_SELECTOR = '.backgrounds>.slide-background';
 
 // Methods that may not be invoked via the postMessage API
-export const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener/;
+export const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener|showPreview/;
 
 // Regex for retrieving the fragment style from a class attribute
-export const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;
+export const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;
+
+// Slide number formats
+export const SLIDE_NUMBER_FORMAT_HORIZONTAL_DOT_VERTICAL = 'h.v';
+export const SLIDE_NUMBER_FORMAT_HORIZONTAL_SLASH_VERTICAL = 'h/v';
+export const SLIDE_NUMBER_FORMAT_CURRENT = 'c';
+export const SLIDE_NUMBER_FORMAT_CURRENT_SLASH_TOTAL = 'c/t';

js/utils/device.js

@@ -1,17 +1,8 @@
 const UA = navigator.userAgent;
-const testElement = document.createElement( 'div' );
 
 export const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||
 						( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS
 
 export const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
 
-export const isAndroid = /android/gi.test( UA );
-
-// Flags if we should use zoom instead of transform to scale
-// up slides. Zoom produces crisper results but has a lot of
-// xbrowser quirks so we only use it in whitelisted browsers.
-export const supportsZoom = 'zoom' in testElement.style && !isMobile &&
-				( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
-
-export const supportsHistoryAPI = typeof window.history.replaceState === 'function' && !/PhantomJS/.test( UA );
+export const isAndroid = /android/gi.test( UA );

js/utils/util.js

@@ -85,6 +85,23 @@ export const transformElement = ( element, transform ) => {
 
 }
 
+/**
+ * Element.matches with IE support.
+ *
+ * @param {HTMLElement} target The element to match
+ * @param {String} selector The CSS selector to match
+ * the element against
+ *
+ * @return {Boolean}
+ */
+export const matches = ( target, selector ) => {
+
+	let matchesMethod = target.matches || target.matchesSelector || target.msMatchesSelector;
+
+	return !!( matchesMethod && matchesMethod.call( target, selector ) );
+
+}
+
 /**
  * Find the closest parent that matches the given
  * selector.
@@ -96,25 +113,21 @@ export const transformElement = ( element, transform ) => {
  * @return {HTMLElement} The matched parent or null
  * if no matching parent was found
  */
-export const closestParent = ( target, selector ) => {
+export const closest = ( target, selector ) => {
 
-	let parent = target.parentNode;
+	// Native Element.closest
+	if( typeof target.closest === 'function' ) {
+		return target.closest( selector );
+	}
 
-	while( parent ) {
-
-		// There's some overhead doing this each time, we don't
-		// want to rewrite the element prototype but should still
-		// be enough to feature detect once at startup...
-		let matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
-
-		// If we find a match, we're all set
-		if( matchesMethod && matchesMethod.call( parent, selector ) ) {
-			return parent;
+	// Polyfill
+	while( target ) {
+		if( matches( target, selector ) ) {
+			return target;
 		}
 
 		// Keep searching
-		parent = parent.parentNode;
-
+		target = target.parentNode;
 	}
 
 	return null;
@@ -266,4 +279,35 @@ export const getRemainingHeight = ( element, height = 0 ) => {
 
 	return height;
 
+}
+
+const fileExtensionToMimeMap = {
+	'mp4': 'video/mp4',
+	'm4a': 'video/mp4',
+	'ogv': 'video/ogg',
+	'mpeg': 'video/mpeg',
+	'webm': 'video/webm'
+}
+
+/**
+ * Guess the MIME type for common file formats.
+ */
+export const getMimeTypeFromFile = ( filename='' ) => {
+	return fileExtensionToMimeMap[filename.split('.').pop()]
+}
+
+/**
+ * Encodes a string for RFC3986-compliant URL format.
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURI#encoding_for_rfc3986
+ *
+ * @param {string} url
+ */
+export const encodeRFC3986URI = ( url='' ) => {
+	return encodeURI(url)
+	  .replace(/%5B/g, "[")
+	  .replace(/%5D/g, "]")
+	  .replace(
+		/[!'()*]/g,
+		(c) => `%${c.charCodeAt(0).toString(16).toUpperCase()}`
+	  );
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "reveal.js",
-  "version": "4.0.0-rc.1",
+  "version": "5.2.0",
   "description": "The HTML Presentation Framework",
   "homepage": "https://revealjs.com",
   "subdomain": "revealjs",
@@ -22,7 +22,7 @@
     "url": "git://github.com/hakimel/reveal.js.git"
   },
   "engines": {
-    "node": ">=10.0.0"
+    "node": ">=18.0.0"
   },
   "keywords": [
     "reveal",
@@ -30,43 +30,53 @@
     "presentation"
   ],
   "devDependencies": {
-    "@babel/core": "^7.8.7",
-    "@babel/preset-env": "^7.8.7",
-    "@rollup/plugin-commonjs": "^11.1.0",
-    "@rollup/plugin-node-resolve": "^7.1.3",
-    "babel-eslint": "^10.1.0",
-    "babel-plugin-transform-html-import-to-string": "0.0.1",
+    "@babel/core": "^7.23.2",
+    "@babel/eslint-parser": "^7.22.15",
+    "@babel/preset-env": "^7.23.2",
+    "@rollup/plugin-babel": "^6.0.4",
+    "@rollup/plugin-commonjs": "^25.0.7",
+    "@rollup/plugin-node-resolve": "^15.2.3",
+    "@rollup/plugin-terser": "^0.4.4",
+    "babel-plugin-transform-html-import-to-string": "2.0.0",
     "colors": "^1.4.0",
-    "core-js": "^3.6.5",
-    "glob": "^7.1.6",
-    "gulp": "^4.0.2",
-    "gulp-autoprefixer": "^7.0.1",
-    "gulp-clean-css": "^4.2.0",
+    "core-js": "^3.33.1",
+    "fitty": "^2.3.7",
+    "glob": "^10.3.10",
+    "gulp": "^5.0.0",
+    "gulp-autoprefixer": "^8.0.0",
+    "gulp-clean-css": "^4.3.0",
     "gulp-connect": "^5.7.0",
     "gulp-eslint": "^6.0.0",
-    "gulp-header": "^2.0.9",
-    "gulp-sass": "^4.0.2",
-    "gulp-tap": "^2.0.0",
-    "gulp-zip": "^5.0.1",
-    "highlight.js": "^10.0.1",
-    "marked": "^1.0.0",
-    "node-qunit-puppeteer": "^2.0.1",
-    "qunit": "^2.9.3",
-    "rollup": "^2.6.1",
-    "rollup-plugin-babel": "^4.4.0",
-    "rollup-plugin-terser": "^5.3.0",
-    "yargs": "^15.1.0"
+    "gulp-header-comment": "^0.10.0",
+    "gulp-zip": "^5.1.0",
+    "highlight.js": "^11.9.0",
+    "marked": "^4.3.0",
+    "node-qunit-puppeteer": "^2.2.0",
+    "through2": "^4.0.2",
+    "qunit": "^2.22.0",
+    "rollup": "^4.1.5",
+    "sass": "^1.79.4",
+    "yargs": "^17.7.2"
   },
-  "browserslist": "> 0.5%, IE 11, not dead",
+  "overrides": {
+    "gulp-connect": {
+      "send": "0.19.0"
+    },
+    "gulp-header-comment": {
+      "moment": "2.30.1"
+    }
+  },
+  "browserslist": "> 2%, not dead",
   "eslintConfig": {
     "env": {
       "browser": true,
       "es6": true
     },
-    "parser": "babel-eslint",
+    "parser": "@babel/eslint-parser",
     "parserOptions": {
       "sourceType": "module",
-      "allowImportExportEverywhere": true
+      "allowImportExportEverywhere": true,
+      "requireConfigFile": false
     },
     "globals": {
       "module": false,

plugin/highlight/plugin.js

@@ -1,8 +1,8 @@
-import hljs from 'highlight.js'
+import hljs from 'highlight.js';
+
+/* highlightjs-line-numbers.js 2.8.0 | (C) 2018 Yauheni Pakala | MIT License | github.com/wcoder/highlightjs-line-numbers.js */
+!function(r,o){"use strict";var e,i="hljs-ln",l="hljs-ln-line",h="hljs-ln-code",s="hljs-ln-numbers",c="hljs-ln-n",m="data-line-number",a=/\r\n|\r|\n/g;function u(e){for(var n=e.toString(),t=e.anchorNode;"TD"!==t.nodeName;)t=t.parentNode;for(var r=e.focusNode;"TD"!==r.nodeName;)r=r.parentNode;var o=parseInt(t.dataset.lineNumber),a=parseInt(r.dataset.lineNumber);if(o==a)return n;var i,l=t.textContent,s=r.textContent;for(a<o&&(i=o,o=a,a=i,i=l,l=s,s=i);0!==n.indexOf(l);)l=l.slice(1);for(;-1===n.lastIndexOf(s);)s=s.slice(0,-1);for(var c=l,u=function(e){for(var n=e;"TABLE"!==n.nodeName;)n=n.parentNode;return n}(t),d=o+1;d<a;++d){var f=p('.{0}[{1}="{2}"]',[h,m,d]);c+="\n"+u.querySelector(f).textContent}return c+="\n"+s}function n(e){try{var n=o.querySelectorAll("code.hljs,code.nohighlight");for(var t in n)n.hasOwnProperty(t)&&(n[t].classList.contains("nohljsln")||d(n[t],e))}catch(e){r.console.error("LineNumbers error: ",e)}}function d(e,n){if("object"==typeof e)e.innerHTML=f(e,n)}function f(e,n){var t,r,o=(t=e,{singleLine:function(e){return!!e.singleLine&&e.singleLine}(r=(r=n)||{}),startFrom:function(e,n){var t=1;isFinite(n.startFrom)&&(t=n.startFrom);var r=function(e,n){return e.hasAttribute(n)?e.getAttribute(n):null}(e,"data-ln-start-from");return null!==r&&(t=function(e,n){if(!e)return n;var t=Number(e);return isFinite(t)?t:n}(r,1)),t}(t,r)});return function e(n){var t=n.childNodes;for(var r in t){var o;t.hasOwnProperty(r)&&(o=t[r],0<(o.textContent.trim().match(a)||[]).length&&(0<o.childNodes.length?e(o):v(o.parentNode)))}}(e),function(e,n){var t=g(e);""===t[t.length-1].trim()&&t.pop();if(1<t.length||n.singleLine){for(var r="",o=0,a=t.length;o<a;o++)r+=p('<tr><td class="{0} {1}" {3}="{5}"><div class="{2}" {3}="{5}"></div></td><td class="{0} {4}" {3}="{5}">{6}</td></tr>',[l,s,c,m,h,o+n.startFrom,0<t[o].length?t[o]:" "]);return p('<table class="{0}">{1}</table>',[i,r])}return e}(e.innerHTML,o)}function v(e){var n=e.className;if(/hljs-/.test(n)){for(var t=g(e.innerHTML),r=0,o="";r<t.length;r++){o+=p('<span class="{0}">{1}</span>\n',[n,0<t[r].length?t[r]:" "])}e.innerHTML=o.trim()}}function g(e){return 0===e.length?[]:e.split(a)}function p(e,t){return e.replace(/\{(\d+)\}/g,function(e,n){return void 0!==t[n]?t[n]:e})}hljs?(hljs.initLineNumbersOnLoad=function(e){"interactive"===o.readyState||"complete"===o.readyState?n(e):r.addEventListener("DOMContentLoaded",function(){n(e)})},hljs.lineNumbersBlock=d,hljs.lineNumbersValue=function(e,n){if("string"!=typeof e)return;var t=document.createElement("code");return t.innerHTML=e,f(t,n)},(e=o.createElement("style")).type="text/css",e.innerHTML=p(".{0}{border-collapse:collapse}.{0} td{padding:0}.{1}:before{content:attr({2})}",[i,c,m]),o.getElementsByTagName("head")[0].appendChild(e)):r.console.error("highlight.js not detected!"),document.addEventListener("copy",function(e){var n,t=window.getSelection();!function(e){for(var n=e;n;){if(n.className&&-1!==n.className.indexOf("hljs-ln-code"))return 1;n=n.parentNode}}(t.anchorNode)||(n=-1!==window.navigator.userAgent.indexOf("Edge")?u(t):t.toString(),e.clipboardData.setData("text/plain",n),e.preventDefault())})}(window,document);
 
-/* highlightjs-line-numbers.js 2.6.0 | (C) 2018 Yauheni Pakala | MIT License | github.com/wcoder/highlightjs-line-numbers.js */
-/* Edited by Hakim for reveal.js; removed async timeout */
-!function(n,e){"use strict";function t(){var n=e.createElement("style");n.type="text/css",n.innerHTML=g(".{0}{border-collapse:collapse}.{0} td{padding:0}.{1}:before{content:attr({2})}",[v,L,b]),e.getElementsByTagName("head")[0].appendChild(n)}function r(t){"interactive"===e.readyState||"complete"===e.readyState?i(t):n.addEventListener("DOMContentLoaded",function(){i(t)})}function i(t){try{var r=e.querySelectorAll("code.hljs,code.nohighlight");for(var i in r)r.hasOwnProperty(i)&&l(r[i],t)}catch(o){n.console.error("LineNumbers error: ",o)}}function l(n,e){"object"==typeof n&&f(function(){n.innerHTML=s(n,e)})}function o(n,e){if("string"==typeof n){var t=document.createElement("code");return t.innerHTML=n,s(t,e)}}function s(n,e){e=e||{singleLine:!1};var t=e.singleLine?0:1;return c(n),a(n.innerHTML,t)}function a(n,e){var t=u(n);if(""===t[t.length-1].trim()&&t.pop(),t.length>e){for(var r="",i=0,l=t.length;i<l;i++)r+=g('<tr><td class="{0}"><div class="{1} {2}" {3}="{5}"></div></td><td class="{4}"><div class="{1}">{6}</div></td></tr>',[j,m,L,b,p,i+1,t[i].length>0?t[i]:" "]);return g('<table class="{0}">{1}</table>',[v,r])}return n}function c(n){var e=n.childNodes;for(var t in e)if(e.hasOwnProperty(t)){var r=e[t];h(r.textContent)>0&&(r.childNodes.length>0?c(r):d(r.parentNode))}}function d(n){var e=n.className;if(/hljs-/.test(e)){for(var t=u(n.innerHTML),r=0,i="";r<t.length;r++){var l=t[r].length>0?t[r]:" ";i+=g('<span class="{0}">{1}</span>\n',[e,l])}n.innerHTML=i.trim()}}function u(n){return 0===n.length?[]:n.split(y)}function h(n){return(n.trim().match(y)||[]).length}function f(e){e()}function g(n,e){return n.replace(/\{(\d+)\}/g,function(n,t){return e[t]?e[t]:n})}var v="hljs-ln",m="hljs-ln-line",p="hljs-ln-code",j="hljs-ln-numbers",L="hljs-ln-n",b="data-line-number",y=/\r\n|\r|\n/g;hljs?(hljs.initLineNumbersOnLoad=r,hljs.lineNumbersBlock=l,hljs.lineNumbersValue=o,t()):n.console.error("highlight.js not detected!")}(window,document);
 
 /*!
  * reveal.js plugin that adds syntax highlight support.
@@ -16,8 +16,10 @@ const Plugin = {
 	HIGHLIGHT_LINE_DELIMITER: ',',
 	HIGHLIGHT_LINE_RANGE_DELIMITER: '-',
 
+	hljs,
+
 	/**
-	 * Highlights code blocks withing the given deck.
+	 * Highlights code blocks within the given deck.
 	 *
 	 * Note that this can be called multiple times if
 	 * there are multiple presentations on one page.
@@ -27,33 +29,53 @@ const Plugin = {
 	init: function( reveal ) {
 
 		// Read the plugin config options and provide fallbacks
-		var config = reveal.getConfig().highlight || {};
+		let config = reveal.getConfig().highlight || {};
+
 		config.highlightOnLoad = typeof config.highlightOnLoad === 'boolean' ? config.highlightOnLoad : true;
 		config.escapeHTML = typeof config.escapeHTML === 'boolean' ? config.escapeHTML : true;
 
-		[].slice.call( reveal.getRevealElement().querySelectorAll( 'pre code' ) ).forEach( function( block ) {
+		Array.from( reveal.getRevealElement().querySelectorAll( 'pre code' ) ).forEach( block => {
+
+			block.parentNode.classList.add('code-wrapper');
+
+			// Code can optionally be wrapped in script template to avoid
+			// HTML being parsed by the browser (i.e. when you need to
+			// include <, > or & in your code).
+			let substitute = block.querySelector( 'script[type="text/template"]' );
+			if( substitute ) {
+				// textContent handles the HTML entity escapes for us
+				block.textContent = substitute.innerHTML;
+			}
 
 			// Trim whitespace if the "data-trim" attribute is present
 			if( block.hasAttribute( 'data-trim' ) && typeof block.innerHTML.trim === 'function' ) {
 				block.innerHTML = betterTrim( block );
 			}
 
-			// Escape HTML tags unless the "data-noescape" attrbute is present
+			// Escape HTML tags unless the "data-noescape" attribute is present
 			if( config.escapeHTML && !block.hasAttribute( 'data-noescape' )) {
 				block.innerHTML = block.innerHTML.replace( /</g,"&lt;").replace(/>/g, '&gt;' );
 			}
 
 			// Re-highlight when focus is lost (for contenteditable code)
 			block.addEventListener( 'focusout', function( event ) {
-				hljs.highlightBlock( event.currentTarget );
+				hljs.highlightElement( event.currentTarget );
 			}, false );
 
-			if( config.highlightOnLoad ) {
-				Plugin.highlightBlock( block );
-			}
-
 		} );
 
+		// Triggers a callback function before we trigger highlighting
+		if( typeof config.beforeHighlight === 'function' ) {
+			config.beforeHighlight( hljs );
+		}
+
+		// Run initial highlighting for all code
+		if( config.highlightOnLoad ) {
+			Array.from( reveal.getRevealElement().querySelectorAll( 'pre code' ) ).forEach( block => {
+				Plugin.highlightBlock( block );
+			} );
+		}
+
 		// If we're printing to PDF, scroll the code highlights of
 		// all blocks in the deck into view at once
 		reveal.on( 'pdf-ready', function() {
@@ -74,7 +96,7 @@ const Plugin = {
 	 */
 	highlightBlock: function( block ) {
 
-		hljs.highlightBlock( block );
+		hljs.highlightElement( block );
 
 		// Don't generate line numbers for empty code blocks
 		if( block.innerHTML.trim().length === 0 ) return;
@@ -84,7 +106,7 @@ const Plugin = {
 
 			var scrollState = { currentBlock: block };
 
-			// If there is at least one highlight step, generate
+			// If there is more than one highlight step, generate
 			// fragments
 			var highlightSteps = Plugin.deserializeHighlightSteps( block.getAttribute( 'data-line-numbers' ) );
 			if( highlightSteps.length > 1 ) {
@@ -116,11 +138,11 @@ const Plugin = {
 
 					// Scroll highlights into view as we step through them
 					fragmentBlock.addEventListener( 'visible', Plugin.scrollHighlightedLineIntoView.bind( Plugin, fragmentBlock, scrollState ) );
-					fragmentBlock.addEventListener( 'hidden', Plugin.scrollHighlightedLineIntoView.bind( Plugin, fragmentBlock.previousSibling, scrollState ) );
+					fragmentBlock.addEventListener( 'hidden', Plugin.scrollHighlightedLineIntoView.bind( Plugin, fragmentBlock.previousElementSibling, scrollState ) );
 
 				} );
 
-				block.removeAttribute( 'data-fragment-index' )
+				block.removeAttribute( 'data-fragment-index' );
 				block.setAttribute( 'data-line-numbers', Plugin.serializeHighlightSteps( [ highlightSteps[0] ] ) );
 
 			}