fix: keyboard accessibility for example site (#5946)

* fix: keyboard accessibility for example site

* chore: remove redundant assignment of DOM attribute

Co-authored-by: Joe Anderson <joe@anderbell.studio>

* refactor: replace MouseEvent with PointerEvent for improved button interactions

---------

Co-authored-by: Joe Anderson <joe@anderbell.studio>

site/examples/ts/code-highlighting.tsx

@@ -10,7 +10,7 @@ import 'prismjs/components/prism-python'
 import 'prismjs/components/prism-sql'
 import 'prismjs/components/prism-tsx'
 import 'prismjs/components/prism-typescript'
-import React, { ChangeEvent, MouseEvent, useCallback, useState } from 'react'
+import React, { ChangeEvent, PointerEvent, useCallback, useState } from 'react'
 import {
   Editor,
   Element,
@@ -143,10 +143,10 @@ const CodeBlockButton = () => {
     <Button
       data-test-id="code-block-button"
       active
-      onMouseDown={(event: MouseEvent<HTMLButtonElement>) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) => {
         event.preventDefault()
-        handleClick()
       }}
+      onClick={handleClick}
     >
       <Icon>code</Icon>
     </Button>

site/examples/ts/components/index.tsx

@@ -20,14 +20,16 @@ export const Button = React.forwardRef(
         reversed: boolean
       } & BaseProps
     >,
-    ref: Ref<HTMLSpanElement>
+    ref: Ref<HTMLButtonElement>
   ) => (
-    <span
+    <button
       {...props}
       ref={ref}
       className={cx(
-        className,
         css`
+          border: none;
+          background: none;
+          padding: 0;
           cursor: pointer;
           color: ${reversed
             ? active
@@ -36,7 +38,8 @@ export const Button = React.forwardRef(
             : active
             ? 'black'
             : '#ccc'};
-        `
+        `,
+        className
       )}
     />
   )

site/examples/ts/editable-voids.tsx

@@ -1,5 +1,5 @@
 import { css } from '@emotion/css'
-import React, { MouseEvent, useMemo, useState } from 'react'
+import React, { PointerEvent, useMemo, useState } from 'react'
 import { createEditor, Descendant, Transforms } from 'slate'
 import { withHistory } from 'slate-history'
 import {
@@ -130,10 +130,10 @@ const InsertEditableVoidButton = () => {
   const editor = useSlateStatic()
   return (
     <Button
-      onMouseDown={(event: MouseEvent<HTMLSpanElement>) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) => {
         event.preventDefault()
-        insertEditableVoid(editor)
       }}
+      onClick={() => insertEditableVoid(editor)}
     >
       <Icon>add</Icon>
     </Button>

site/examples/ts/iframe.tsx

@@ -1,5 +1,5 @@
 import isHotkey from 'is-hotkey'
-import React, { MouseEvent, useCallback, useMemo, useState } from 'react'
+import React, { PointerEvent, useCallback, useMemo, useState } from 'react'
 import { createPortal } from 'react-dom'
 import { Editor, createEditor, Descendant } from 'slate'
 import { withHistory } from 'slate-history'
@@ -115,10 +115,10 @@ const MarkButton = ({ format, icon }: MarkButtonProps) => {
   return (
     <Button
       active={isMarkActive(editor, format)}
-      onMouseDown={(event: MouseEvent) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) => {
         event.preventDefault()
-        toggleMark(editor, format)
       }}
+      onClick={() => toggleMark(editor, format)}
     >
       <Icon>{icon}</Icon>
     </Button>

site/examples/ts/images.tsx

@@ -2,7 +2,7 @@ import { css } from '@emotion/css'
 import imageExtensions from 'image-extensions'
 import isHotkey from 'is-hotkey'
 import isUrl from 'is-url'
-import React, { MouseEvent, useMemo } from 'react'
+import React, { PointerEvent, useMemo } from 'react'
 import { Descendant, Transforms, createEditor } from 'slate'
 import { withHistory } from 'slate-history'
 import {
@@ -135,6 +135,9 @@ const Image = ({
         />
         <Button
           active
+          onPointerDown={(event: PointerEvent<HTMLButtonElement>) => {
+            event.preventDefault()
+          }}
           onClick={() => Transforms.removeNodes(editor, { at: path })}
           className={css`
             display: ${selected && focused ? 'inline' : 'none'};
@@ -155,8 +158,10 @@ const InsertImageButton = () => {
   const editor = useSlateStatic()
   return (
     <Button
-      onMouseDown={(event: MouseEvent) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) =>
         event.preventDefault()
+      }
+      onClick={() => {
         const url = window.prompt('Enter the URL of the image:')
         if (url && !isImageUrl(url)) {
           alert('URL is not an image')

site/examples/ts/inlines.tsx

@@ -1,7 +1,7 @@
 import { css } from '@emotion/css'
 import { isKeyHotkey } from 'is-hotkey'
 import isUrl from 'is-url'
-import React, { MouseEvent, useMemo } from 'react'
+import React, { PointerEvent, useMemo } from 'react'
 import {
   createEditor,
   Descendant,
@@ -400,8 +400,10 @@ const AddLinkButton = () => {
   return (
     <Button
       active={isLinkActive(editor)}
-      onMouseDown={(event: MouseEvent) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) =>
         event.preventDefault()
+      }
+      onClick={() => {
         const url = window.prompt('Enter the URL of the link:')
         if (!url) return
         insertLink(editor, url)
@@ -418,7 +420,10 @@ const RemoveLinkButton = () => {
   return (
     <Button
       active={isLinkActive(editor)}
-      onMouseDown={(event: MouseEvent) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) =>
+        event.preventDefault()
+      }
+      onClick={() => {
         if (isLinkActive(editor)) {
           unwrapLink(editor)
         }
@@ -434,8 +439,10 @@ const ToggleEditableButtonButton = () => {
   return (
     <Button
       active
-      onMouseDown={(event: MouseEvent) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) =>
         event.preventDefault()
+      }
+      onClick={() => {
         if (isButtonActive(editor)) {
           unwrapButton(editor)
         } else {

site/examples/ts/richtext.tsx

@@ -1,5 +1,5 @@
 import isHotkey from 'is-hotkey'
-import React, { KeyboardEvent, MouseEvent, useCallback, useMemo } from 'react'
+import React, { KeyboardEvent, PointerEvent, useCallback, useMemo } from 'react'
 import {
   Descendant,
   Editor,
@@ -247,10 +247,10 @@ const BlockButton = ({ format, icon }: BlockButtonProps) => {
         format,
         isAlignType(format) ? 'align' : 'type'
       )}
-      onMouseDown={(event: MouseEvent<HTMLSpanElement>) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) =>
         event.preventDefault()
-        toggleBlock(editor, format)
+      }
-      }}
+      onClick={() => toggleBlock(editor, format)}
     >
       <Icon>{icon}</Icon>
     </Button>
@@ -267,10 +267,10 @@ const MarkButton = ({ format, icon }: MarkButtonProps) => {
   return (
     <Button
       active={isMarkActive(editor, format)}
-      onMouseDown={(event: MouseEvent<HTMLSpanElement>) => {
+      onPointerDown={(event: PointerEvent<HTMLButtonElement>) =>
         event.preventDefault()
-        toggleMark(editor, format)
+      }
-      }}
+      onClick={() => toggleMark(editor, format)}
     >
       <Icon>{icon}</Icon>
     </Button>

site/pages/examples/[example].tsx

@@ -135,6 +135,9 @@ const TabList = ({
   ...props
 }: React.HTMLAttributes<HTMLDivElement> & { isVisible?: boolean }) => (
   <div
+    role="menu"
+    aria-label="Examples navigation"
+    aria-hidden={!isVisible}
     {...props}
     className={css`
       background-color: #222;
@@ -143,11 +146,14 @@ const TabList = ({
       overflow: auto;
       padding-top: 0.2em;
       position: absolute;
-      transition: width 0.2s;
+      transition:
+        width 0.2s,
+        visibility 0.2s;
       width: ${isVisible ? '200px' : '0'};
       white-space: nowrap;
       max-height: 70vh;
       z-index: 3; /* To appear above the underlay */
+      visibility: ${isVisible ? 'visible' : 'hidden'};
     `}
   />
 )
@@ -171,10 +177,16 @@ const TabListUnderlay = ({
 )
 
 const TabButton = (props: React.HTMLAttributes<HTMLSpanElement>) => (
-  <span
+  <button
     {...props}
+    aria-label="Toggle examples menu"
+    aria-haspopup="menu"
     className={css`
       margin-left: 0.8em;
+      background: none;
+      border: none;
+      cursor: pointer;
+      padding: 0;
 
       &:hover {
         cursor: pointer;
@@ -204,6 +216,8 @@ const Tab = React.forwardRef(
     <a
       ref={ref}
       href={href}
+      role="menuitem"
+      aria-current={active ? 'page' : undefined}
       {...props}
       className={css`
         display: inline-block;
@@ -342,6 +356,12 @@ const ExamplePage = ({ example }: { example: string }) => {
               e.stopPropagation()
               setShowTabs(!showTabs)
             }}
+            onKeyDown={(e: React.KeyboardEvent) => {
+              if (e.key === 'Escape') {
+                setShowTabs(false)
+              }
+            }}
+            aria-expanded={showTabs}
           >
             <Icon>menu</Icon>
           </TabButton>
@@ -368,7 +388,17 @@ const ExamplePage = ({ example }: { example: string }) => {
               legacyBehavior
               passHref
             >
-              <Tab onClick={() => setShowTabs(false)}>{n}</Tab>
+              <Tab
+                onClick={() => setShowTabs(false)}
+                active={p === path}
+                onKeyDown={(e: React.KeyboardEvent) => {
+                  if (e.key === 'Escape') {
+                    setShowTabs(false)
+                  }
+                }}
+              >
+                {n}
+              </Tab>
             </Link>
           ))}
         </TabList>
@@ -393,6 +423,11 @@ const ExamplePage = ({ example }: { example: string }) => {
         <TabListUnderlay
           isVisible={showTabs}
           onClick={() => setShowTabs(false)}
+          onKeyDown={(e: React.KeyboardEvent) => {
+            if (e.key === 'Escape') {
+              setShowTabs(false)
+            }
+          }}
         />
       </div>
     </ErrorBoundary>