diff --git a/examples/rich-text/index.js b/examples/rich-text/index.js
index 55a1ec590..4874a7f97 100644
--- a/examples/rich-text/index.js
+++ b/examples/rich-text/index.js
@@ -307,6 +307,7 @@ class RichText extends React.Component {
           renderMark={this.renderMark}
           onChange={this.onChange}
           onKeyDown={this.onKeyDown}
+          style={{}}
         />
       </div>
     )
diff --git a/lib/components/content.js b/lib/components/content.js
index 892c89c77..6aed0ce16 100644
--- a/lib/components/content.js
+++ b/lib/components/content.js
@@ -1,5 +1,6 @@
 
 import Base64 from '../serializers/base-64'
+import Debug from 'debug'
 import Node from './node'
 import OffsetKey from '../utils/offset-key'
 import React from 'react'
@@ -9,6 +10,14 @@ import includes from 'lodash/includes'
 import keycode from 'keycode'
 import { IS_FIREFOX, IS_MAC } from '../utils/environment'
 
+/**
+ * Debug.
+ *
+ * @type {Function}
+ */
+
+const debug = Debug('slate:content')
+
 /**
  * Noop.
  *
@@ -101,7 +110,7 @@ class Content extends React.Component {
    * While rendering, set the `isRendering` flag.
    *
    * @param {Object} props
-   * @param {Object} state]
+   * @param {Object} state
    */
 
   componentWillUpdate = (props, state) => {
@@ -112,7 +121,7 @@ class Content extends React.Component {
    * When finished rendering, move the `isRendering` flag on next tick.
    *
    * @param {Object} props
-   * @param {Object} state]
+   * @param {Object} state
    */
 
   componentDidUpdate = (props, state) => {
@@ -162,6 +171,8 @@ class Content extends React.Component {
     if (isNonEditable(e)) return
 
     const data = {}
+
+    debug('onBeforeInput', data)
     this.props.onBeforeInput(e, data)
   }
 
@@ -177,6 +188,8 @@ class Content extends React.Component {
     if (isNonEditable(e)) return
 
     const data = {}
+
+    debug('onBlur', data)
     this.props.onBlur(e, data)
   }
 
@@ -187,6 +200,7 @@ class Content extends React.Component {
    */
 
   onChange = (state) => {
+    debug('onChange', state)
     this.props.onChange(state)
   }
 
@@ -201,6 +215,8 @@ class Content extends React.Component {
 
     this.tmp.isComposing = true
     this.tmp.compositions++
+
+    debug('onCompositionStart')
   }
 
   /**
@@ -224,6 +240,8 @@ class Content extends React.Component {
       if (this.tmp.compositions > count) return
       this.tmp.isComposing = false
     })
+
+    debug('onCompositionEnd')
   }
 
   /**
@@ -244,6 +262,8 @@ class Content extends React.Component {
     const data = {}
     data.type = 'fragment'
     data.fragment = state.fragment
+
+    debug('onCopy', data)
     this.props.onCopy(e, data)
   }
 
@@ -266,6 +286,8 @@ class Content extends React.Component {
     const data = {}
     data.type = 'fragment'
     data.fragment = state.fragment
+
+    debug('onCut', data)
     this.props.onCut(e, data)
   }
 
@@ -280,6 +302,8 @@ class Content extends React.Component {
 
     this.tmp.isDragging = false
     this.tmp.isInternalDrag = null
+
+    debug('onDragEnd')
   }
 
   /**
@@ -303,6 +327,8 @@ class Content extends React.Component {
     if (this.tmp.isDragging) return
     this.tmp.isDragging = true
     this.tmp.isInternalDrag = false
+
+    debug('onDragOver')
   }
 
   /**
@@ -327,6 +353,8 @@ class Content extends React.Component {
     const { fragment } = state
     const encoded = Base64.serializeNode(fragment)
     data.setData(TYPES.FRAGMENT, encoded)
+
+    debug('onDragStart')
   }
 
   /**
@@ -413,6 +441,8 @@ class Content extends React.Component {
 
     data.target = target
     data.effect = dataTransfer.dropEffect
+
+    debug('onDrop', data)
     this.props.onDrop(e, data)
   }
 
@@ -424,8 +454,9 @@ class Content extends React.Component {
    */
 
   onInput = (e) => {
-    if (this.isComposing) return
+    if (this.tmp.isComposing) return
     if (isNonEditable(e)) return
+    debug('onInput')
 
     let { state, renderDecorations } = this.props
     const { selection } = state
@@ -483,6 +514,17 @@ class Content extends React.Component {
     const key = keycode(e.which)
     const data = {}
 
+    // When composing, these characters commit the composition but also move the
+    // selection before we're able to handle it, so prevent their default,
+    // selection-moving behavior.
+    if (
+      this.tmp.isComposing &&
+      (key == 'left' || key == 'right' || key == 'up' || key == 'down')
+    ) {
+      e.preventDefault()
+      return
+    }
+
     // Add helpful properties for handling hotkeys to the data object.
     data.code = e.which
     data.key = key
@@ -495,17 +537,6 @@ class Content extends React.Component {
     data.isShift = e.shiftKey
     data.isWord = IS_MAC ? e.altKey : e.ctrlKey
 
-    // When composing, these characters commit the composition but also move the
-    // selection before we're able to handle it, so prevent their default,
-    // selection-moving behavior.
-    if (
-      this.tmp.isComposing &&
-      (key == 'left' || key == 'right' || key == 'up' || key == 'down')
-    ) {
-      e.preventDefault()
-      return
-    }
-
     // These key commands have native behavior in contenteditable elements which
     // will cause our state to be out of sync, so prevent them.
     if (
@@ -520,6 +551,7 @@ class Content extends React.Component {
       e.preventDefault()
     }
 
+    debug('onKeyDown', data)
     this.props.onKeyDown(e, data)
   }
 
@@ -571,6 +603,7 @@ class Content extends React.Component {
       data.fragment = Base64.deserializeNode(encoded)
     }
 
+    debug('onPaste', data)
     this.props.onPaste(e, data)
   }
 
@@ -631,6 +664,7 @@ class Content extends React.Component {
         .normalize(document)
     }
 
+    debug('onSelect', data)
     this.props.onSelect(e, data)
   }
 
@@ -641,6 +675,8 @@ class Content extends React.Component {
    */
 
   render = () => {
+    debug('render')
+
     const { className, readOnly, state } = this.props
     const { document } = state
     const children = document.nodes
diff --git a/lib/components/editor.js b/lib/components/editor.js
index 429ee4c5d..a01520529 100644
--- a/lib/components/editor.js
+++ b/lib/components/editor.js
@@ -3,8 +3,15 @@ import Content from './content'
 import CorePlugin from '../plugins/core'
 import React from 'react'
 import State from '../models/state'
+import Debug from 'debug'
 import typeOf from 'type-of'
 
+/**
+ * Debug.
+ */
+
+const debug = Debug('slate:editor')
+
 /**
  * Noop.
  *
@@ -197,6 +204,8 @@ class Editor extends React.Component {
    */
 
   render = () => {
+    debug('render')
+
     const handlers = {}
 
     for (const property of EVENT_HANDLERS) {
diff --git a/lib/components/leaf.js b/lib/components/leaf.js
index 83b03bb3c..885ec74de 100644
--- a/lib/components/leaf.js
+++ b/lib/components/leaf.js
@@ -1,16 +1,29 @@
 
+import Debug from 'debug'
 import OffsetKey from '../utils/offset-key'
 import React from 'react'
 import ReactDOM from 'react-dom'
 
+/**
+ * Debugger.
+ *
+ * @type {Function}
+ */
+
+const debug = Debug('slate:leaf')
+
 /**
  * Leaf.
+ *
+ * @type {Component}
  */
 
 class Leaf extends React.Component {
 
   /**
-   * Properties.
+   * Property types.
+   *
+   * @type {Object}
    */
 
   static propTypes = {
@@ -35,6 +48,17 @@ class Leaf extends React.Component {
     this.tmp.renders = 0
   }
 
+  /**
+   * Debug.
+   *
+   * @param {String} message
+   * @param {Mixed} ...args
+   */
+
+  debug = (message, ...args) => {
+    debug(message, `${this.props.node.key}-${this.props.index}`, ...args)
+  }
+
   /**
    * Should component update?
    *
@@ -43,9 +67,6 @@ class Leaf extends React.Component {
    */
 
   shouldComponentUpdate(props) {
-    const { index, node, state } = props
-    const { selection } = state
-
     if (
       props.index != this.props.index ||
       props.marks != this.props.marks ||
@@ -55,9 +76,13 @@ class Leaf extends React.Component {
       return true
     }
 
-    if (state.isBlurred) return false
+    if (props.state.isBlurred) {
+      return false
+    }
+
+    const { index, node, state } = props
     const { start, end } = OffsetKey.findBounds(index, props.ranges)
-    return selection.hasEdgeBetween(node, start, end)
+    return state.selection.hasEdgeBetween(node, start, end)
   }
 
   componentDidMount() {
@@ -132,9 +157,13 @@ class Leaf extends React.Component {
         native.extend(endNode, endOffset)
       }
     }
+
+    this.debug('updateSelection')
   }
 
   render() {
+    this.debug('render')
+
     const { node, index } = this.props
     const offsetKey = OffsetKey.stringify({
       key: node.key,
diff --git a/lib/components/node.js b/lib/components/node.js
index 80558f316..41238564b 100644
--- a/lib/components/node.js
+++ b/lib/components/node.js
@@ -1,9 +1,18 @@
 
 import Base64 from '../serializers/base-64'
+import Debug from 'debug'
 import React from 'react'
 import TYPES from '../utils/types'
 import Text from './text'
 
+/**
+ * Debugger.
+ *
+ * @type {Function}
+ */
+
+const debug = Debug('slate:node')
+
 /**
  * Node.
  *
@@ -25,6 +34,28 @@ class Node extends React.Component {
     style: {}
   }
 
+  /**
+   * Debug.
+   *
+   * @param {String} message
+   * @param {Mixed} ...args
+   */
+
+  debug = (message, ...args) => {
+    const { node } = this.props
+    const { key, kind, type } = node
+    let id = kind == 'text' ? `${key} (${kind})` : `${key} (${type})`
+    debug(message, `${id}`, ...args)
+  }
+
+  /**
+   * Should the node update?
+   *
+   * @param {Object} props
+   * @param {Object} state
+   * @return {Boolean}
+   */
+
   shouldComponentUpdate = (props) => {
     return (
       props.node != this.props.node ||
@@ -43,6 +74,8 @@ class Node extends React.Component {
     const encoded = Base64.serializeNode(node)
     const data = e.nativeEvent.dataTransfer
     data.setData(TYPES.NODE, encoded)
+
+    this.debug('onDragStart', e)
   }
 
   /**
@@ -52,6 +85,8 @@ class Node extends React.Component {
    */
 
   render = () => {
+    this.debug('render')
+
     const { node } = this.props
     return node.kind == 'text'
       ? this.renderText()
diff --git a/package.json b/package.json
index 09aea4e18..782df1c49 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
   "main": "./dist/index.js",
   "dependencies": {
     "cheerio": "^0.20.0",
+    "debug": "^2.2.0",
     "detect-browser": "^1.3.3",
     "direction": "^0.1.5",
     "esrever": "^0.2.0",
@@ -27,20 +28,17 @@
     "babel-cli": "^6.10.1",
     "babel-core": "^6.9.1",
     "babel-eslint": "^6.1.0",
-    "babel-polyfill": "^6.9.1",
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-react": "^6.5.0",
     "babel-preset-stage-0": "^6.5.0",
     "babelify": "^7.3.0",
     "browserify": "^13.0.1",
     "browserify-shim": "^3.8.12",
-    "component-type": "^1.2.1",
     "disc": "^1.3.2",
     "envify": "^3.4.1",
     "eslint": "^3.0.1",
     "eslint-plugin-import": "^1.10.2",
     "eslint-plugin-react": "^5.2.2",
-    "exorcist": "^0.4.0",
     "gh-pages": "^0.11.0",
     "http-server": "^0.9.0",
     "is-image": "^1.0.1",
diff --git a/test/helpers/assert-json.js b/test/helpers/assert-json.js
index 699b49eaa..4136cc49d 100644
--- a/test/helpers/assert-json.js
+++ b/test/helpers/assert-json.js
@@ -1,6 +1,6 @@
 
 import assert from 'assert'
-import type from 'component-type'
+import type from 'type-of'
 
 /**
  * Assertion error.