Merge branch 'v4-dev' of https://github.com/twbs/bootstrap into patch-1

21 files changed, 2232 insertions, 1863 deletions

diff --git a/js/tests/unit/carousel.js b/js/tests/unit/carousel.js
index 017bd9bee..d6d0186e1 100644
--- a/js/tests/unit/carousel.js
+++ b/js/tests/unit/carousel.js
@@ -24,6 +24,18 @@ $(function () {
     assert.strictEqual($.fn.carousel, undefined, 'carousel was set back to undefined (orig value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div/>')
+    $el.bootstrapCarousel()
+    try {
+      $el.bootstrapCarousel('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div/>')
diff --git a/js/tests/unit/collapse.js b/js/tests/unit/collapse.js
index 78fafc6c2..4eadc205b 100644
--- a/js/tests/unit/collapse.js
+++ b/js/tests/unit/collapse.js
@@ -24,6 +24,18 @@ $(function () {
     assert.strictEqual($.fn.collapse, undefined, 'collapse was set back to undefined (org value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div/>')
+    $el.bootstrapCollapse()
+    try {
+      $el.bootstrapCollapse('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div/>')
diff --git a/js/tests/unit/dropdown.js b/js/tests/unit/dropdown.js
index 566b50ee7..e6cda58d4 100644
--- a/js/tests/unit/dropdown.js
+++ b/js/tests/unit/dropdown.js
@@ -24,6 +24,18 @@ $(function () {
     assert.strictEqual($.fn.dropdown, undefined, 'dropdown was set back to undefined (org value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div/>')
+    $el.bootstrapDropdown()
+    try {
+      $el.bootstrapDropdown('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div/>')
diff --git a/js/tests/unit/modal.js b/js/tests/unit/modal.js
index 6da09e3c6..50baac8a3 100644
--- a/js/tests/unit/modal.js
+++ b/js/tests/unit/modal.js
@@ -24,6 +24,18 @@ $(function () {
     assert.strictEqual($.fn.modal, undefined, 'modal was set back to undefined (orig value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div id="modal-test"/>')
+    $el.bootstrapModal()
+    try {
+      $el.bootstrapModal('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div id="modal-test"/>')
diff --git a/js/tests/unit/popover.js b/js/tests/unit/popover.js
index 894468695..fcd7791d2 100644
--- a/js/tests/unit/popover.js
+++ b/js/tests/unit/popover.js
@@ -25,6 +25,18 @@ $(function () {
     assert.strictEqual($.fn.popover, undefined, 'popover was set back to undefined (org value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div/>')
+    $el.bootstrapPopover()
+    try {
+      $el.bootstrapPopover('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div/>')
diff --git a/js/tests/unit/scrollspy.js b/js/tests/unit/scrollspy.js
index 574422ef1..878c4d389 100644
--- a/js/tests/unit/scrollspy.js
+++ b/js/tests/unit/scrollspy.js
@@ -24,6 +24,18 @@ $(function () {
     assert.strictEqual($.fn.scrollspy, undefined, 'scrollspy was set back to undefined (org value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div/>')
+    $el.bootstrapScrollspy()
+    try {
+      $el.bootstrapScrollspy('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div/>')
diff --git a/js/tests/unit/tab.js b/js/tests/unit/tab.js
index 1eed75e90..2e0143293 100644
--- a/js/tests/unit/tab.js
+++ b/js/tests/unit/tab.js
@@ -24,6 +24,18 @@ $(function () {
     assert.strictEqual($.fn.tab, undefined, 'tab was set back to undefined (org value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div/>')
+    $el.bootstrapTab()
+    try {
+      $el.bootstrapTab('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div/>')
diff --git a/js/tests/unit/tooltip.js b/js/tests/unit/tooltip.js
index 934e26b9e..9ec5ddb03 100644
--- a/js/tests/unit/tooltip.js
+++ b/js/tests/unit/tooltip.js
@@ -25,6 +25,18 @@ $(function () {
     assert.strictEqual($.fn.tooltip, undefined, 'tooltip was set back to undefined (org value)')
   })
 
+  QUnit.test('should throw explicit error on undefined method', function (assert) {
+    assert.expect(1)
+    var $el = $('<div/>')
+    $el.bootstrapTooltip()
+    try {
+      $el.bootstrapTooltip('noMethod')
+    }
+    catch (err) {
+      assert.strictEqual(err.message, 'No method named "noMethod"')
+    }
+  })
+
   QUnit.test('should return jquery collection containing the element', function (assert) {
     assert.expect(2)
     var $el = $('<div/>')
diff --git a/js/tests/vendor/jquery.min.js b/js/tests/vendor/jquery.min.js
index 0f60b7bd0..49990d6e1 100644
--- a/js/tests/vendor/jquery.min.js
+++ b/js/tests/vendor/jquery.min.js
@@ -1,5 +1,4 @@
-/*! jQuery v1.11.3 | (c) 2005, 2015 jQuery Foundation, Inc. | jquery.org/license */
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diff --git a/js/tests/vendor/qunit.css b/js/tests/vendor/qunit.css
index f1dcd4e1c..a59e2824c 100644
--- a/js/tests/vendor/qunit.css
+++ b/js/tests/vendor/qunit.css
@@ -1,27 +1,27 @@
 /*!
- * QUnit 1.18.0
+ * QUnit 1.20.0
  * http://qunitjs.com/
  *
  * Copyright jQuery Foundation and other contributors
  * Released under the MIT license
  * http://jquery.org/license
  *
- * Date: 2015-04-03T10:23Z
+ * Date: 2015-10-27T17:53Z
  */
 
 /** Font Family and Sizes */
 
-#qunit-tests, #qunit-header, #qunit-banner, #qunit-testrunner-toolbar, #qunit-userAgent, #qunit-testresult {
+#qunit-tests, #qunit-header, #qunit-banner, #qunit-testrunner-toolbar, #qunit-filteredTest, #qunit-userAgent, #qunit-testresult {
 	font-family: "Helvetica Neue Light", "HelveticaNeue-Light", "Helvetica Neue", Calibri, Helvetica, Arial, sans-serif;
 }
 
-#qunit-testrunner-toolbar, #qunit-userAgent, #qunit-testresult, #qunit-tests li { font-size: small; }
+#qunit-testrunner-toolbar, #qunit-filteredTest, #qunit-userAgent, #qunit-testresult, #qunit-tests li { font-size: small; }
 #qunit-tests { font-size: smaller; }
 
 
 /** Resets */
 
-#qunit-tests, #qunit-header, #qunit-banner, #qunit-userAgent, #qunit-testresult, #qunit-modulefilter {
+#qunit-tests, #qunit-header, #qunit-banner, #qunit-filteredTest, #qunit-userAgent, #qunit-testresult, #qunit-modulefilter {
 	margin: 0;
 	padding: 0;
 }
@@ -68,6 +68,12 @@
 	overflow: hidden;
 }
 
+#qunit-filteredTest {
+	padding: 0.5em 1em 0.5em 1em;
+	background-color: #F4FF77;
+	color: #366097;
+}
+
 #qunit-userAgent {
 	padding: 0.5em 1em 0.5em 1em;
 	background-color: #2B81AF;
@@ -118,8 +124,8 @@
 #qunit-tests.hidepass li.pass {
 	visibility: hidden;
 	position: absolute;
-	width:   0px;
-	height:  0px;
+	width:   0;
+	height:  0;
 	padding: 0;
 	border:  0;
 	margin:  0;
@@ -162,6 +168,10 @@
 	border-radius: 5px;
 }
 
+.qunit-source {
+	margin: 0.6em 0 0.3em;
+}
+
 .qunit-collapsed {
 	display: none;
 }
diff --git a/js/tests/vendor/qunit.js b/js/tests/vendor/qunit.js
index f3542ca9d..904943f08 100644
--- a/js/tests/vendor/qunit.js
+++ b/js/tests/vendor/qunit.js
@@ -1,102 +1,248 @@
 /*!
- * QUnit 1.18.0
+ * QUnit 1.20.0
  * http://qunitjs.com/
  *
  * Copyright jQuery Foundation and other contributors
  * Released under the MIT license
  * http://jquery.org/license
  *
- * Date: 2015-04-03T10:23Z
+ * Date: 2015-10-27T17:53Z
  */
 
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+(function( global ) {
 
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-	config,
-	onErrorFnPrev,
-	loggingCallbacks = {},
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-	toString = Object.prototype.toString,
-	hasOwn = Object.prototype.hasOwnProperty,
-	// Keep a local reference to Date (GH-283)
-	Date = window.Date,
-	now = Date.now || function() {
-		return new Date().getTime();
-	},
-	globalStartCalled = false,
-	runStarted = false,
-	setTimeout = window.setTimeout,
-	clearTimeout = window.clearTimeout,
-	defined = {
-		document: window.document !== undefined,
-		setTimeout: window.setTimeout !== undefined,
-		sessionStorage: (function() {
-			var x = "qunit-test-string";
-			try {
-				sessionStorage.setItem( x, x );
-				sessionStorage.removeItem( x );
-				return true;
-			} catch ( e ) {
-				return false;
+var QUnit = {};
+
+var Date = global.Date;
+var now = Date.now || function() {
+	return new Date().getTime();
+};
+
+var setTimeout = global.setTimeout;
+var clearTimeout = global.clearTimeout;
+
+// Store a local window from the global to allow direct references.
+var window = global.window;
+
+var defined = {
+	document: window && window.document !== undefined,
+	setTimeout: setTimeout !== undefined,
+	sessionStorage: (function() {
+		var x = "qunit-test-string";
+		try {
+			sessionStorage.setItem( x, x );
+			sessionStorage.removeItem( x );
+			return true;
+		} catch ( e ) {
+			return false;
+		}
+	}() )
+};
+
+var fileName = ( sourceFromStacktrace( 0 ) || "" ).replace( /(:\d+)+\)?/, "" ).replace( /.+\//, "" );
+var globalStartCalled = false;
+var runStarted = false;
+
+var toString = Object.prototype.toString,
+	hasOwn = Object.prototype.hasOwnProperty;
+
+// returns a new Array with the elements that are in a but not in b
+function diff( a, b ) {
+	var i, j,
+		result = a.slice();
+
+	for ( i = 0; i < result.length; i++ ) {
+		for ( j = 0; j < b.length; j++ ) {
+			if ( result[ i ] === b[ j ] ) {
+				result.splice( i, 1 );
+				i--;
+				break;
 			}
-		}())
-	},
-	/**
-	 * Provides a normalized error string, correcting an issue
-	 * with IE 7 (and prior) where Error.prototype.toString is
-	 * not properly implemented
-	 *
-	 * Based on http://es5.github.com/#x15.11.4.4
-	 *
-	 * @param {String|Error} error
-	 * @return {String} error message
-	 */
-	errorString = function( error ) {
-		var name, message,
-			errorString = error.toString();
-		if ( errorString.substring( 0, 7 ) === "[object" ) {
-			name = error.name ? error.name.toString() : "Error";
-			message = error.message ? error.message.toString() : "";
-			if ( name && message ) {
-				return name + ": " + message;
-			} else if ( name ) {
-				return name;
-			} else if ( message ) {
-				return message;
+		}
+	}
+	return result;
+}
+
+// from jquery.js
+function inArray( elem, array ) {
+	if ( array.indexOf ) {
+		return array.indexOf( elem );
+	}
+
+	for ( var i = 0, length = array.length; i < length; i++ ) {
+		if ( array[ i ] === elem ) {
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+/**
+ * Makes a clone of an object using only Array or Object as base,
+ * and copies over the own enumerable properties.
+ *
+ * @param {Object} obj
+ * @return {Object} New object with only the own properties (recursively).
+ */
+function objectValues ( obj ) {
+	var key, val,
+		vals = QUnit.is( "array", obj ) ? [] : {};
+	for ( key in obj ) {
+		if ( hasOwn.call( obj, key ) ) {
+			val = obj[ key ];
+			vals[ key ] = val === Object( val ) ? objectValues( val ) : val;
+		}
+	}
+	return vals;
+}
+
+function extend( a, b, undefOnly ) {
+	for ( var prop in b ) {
+		if ( hasOwn.call( b, prop ) ) {
+
+			// Avoid "Member not found" error in IE8 caused by messing with window.constructor
+			// This block runs on every environment, so `global` is being used instead of `window`
+			// to avoid errors on node.
+			if ( prop !== "constructor" || a !== global ) {
+				if ( b[ prop ] === undefined ) {
+					delete a[ prop ];
+				} else if ( !( undefOnly && typeof a[ prop ] !== "undefined" ) ) {
+					a[ prop ] = b[ prop ];
+				}
+			}
+		}
+	}
+
+	return a;
+}
+
+function objectType( obj ) {
+	if ( typeof obj === "undefined" ) {
+		return "undefined";
+	}
+
+	// Consider: typeof null === object
+	if ( obj === null ) {
+		return "null";
+	}
+
+	var match = toString.call( obj ).match( /^\[object\s(.*)\]$/ ),
+		type = match && match[ 1 ];
+
+	switch ( type ) {
+		case "Number":
+			if ( isNaN( obj ) ) {
+				return "nan";
+			}
+			return "number";
+		case "String":
+		case "Boolean":
+		case "Array":
+		case "Set":
+		case "Map":
+		case "Date":
+		case "RegExp":
+		case "Function":
+		case "Symbol":
+			return type.toLowerCase();
+	}
+	if ( typeof obj === "object" ) {
+		return "object";
+	}
+}
+
+// Safe object type checking
+function is( type, obj ) {
+	return QUnit.objectType( obj ) === type;
+}
+
+var getUrlParams = function() {
+	var i, current;
+	var urlParams = {};
+	var location = window.location;
+	var params = location.search.slice( 1 ).split( "&" );
+	var length = params.length;
+
+	if ( params[ 0 ] ) {
+		for ( i = 0; i < length; i++ ) {
+			current = params[ i ].split( "=" );
+			current[ 0 ] = decodeURIComponent( current[ 0 ] );
+
+			// allow just a key to turn on a flag, e.g., test.html?noglobals
+			current[ 1 ] = current[ 1 ] ? decodeURIComponent( current[ 1 ] ) : true;
+			if ( urlParams[ current[ 0 ] ] ) {
+				urlParams[ current[ 0 ] ] = [].concat( urlParams[ current[ 0 ] ], current[ 1 ] );
 			} else {
-				return "Error";
+				urlParams[ current[ 0 ] ] = current[ 1 ];
 			}
-		} else {
-			return errorString;
 		}
-	},
-	/**
-	 * Makes a clone of an object using only Array or Object as base,
-	 * and copies over the own enumerable properties.
-	 *
-	 * @param {Object} obj
-	 * @return {Object} New object with only the own properties (recursively).
-	 */
-	objectValues = function( obj ) {
-		var key, val,
-			vals = QUnit.is( "array", obj ) ? [] : {};
-		for ( key in obj ) {
-			if ( hasOwn.call( obj, key ) ) {
-				val = obj[ key ];
-				vals[ key ] = val === Object( val ) ? objectValues( val ) : val;
+	}
+
+	return urlParams;
+};
+
+// Doesn't support IE6 to IE9, it will return undefined on these browsers
+// See also https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error/Stack
+function extractStacktrace( e, offset ) {
+	offset = offset === undefined ? 4 : offset;
+
+	var stack, include, i;
+
+	if ( e.stack ) {
+		stack = e.stack.split( "\n" );
+		if ( /^error$/i.test( stack[ 0 ] ) ) {
+			stack.shift();
+		}
+		if ( fileName ) {
+			include = [];
+			for ( i = offset; i < stack.length; i++ ) {
+				if ( stack[ i ].indexOf( fileName ) !== -1 ) {
+					break;
+				}
+				include.push( stack[ i ] );
+			}
+			if ( include.length ) {
+				return include.join( "\n" );
 			}
 		}
-		return vals;
-	};
+		return stack[ offset ];
 
-QUnit = {};
+	// Support: Safari <=6 only
+	} else if ( e.sourceURL ) {
+
+		// exclude useless self-reference for generated Error objects
+		if ( /qunit.js$/.test( e.sourceURL ) ) {
+			return;
+		}
+
+		// for actual exceptions, this is useful
+		return e.sourceURL + ":" + e.line;
+	}
+}
+
+function sourceFromStacktrace( offset ) {
+	var error = new Error();
+
+	// Support: Safari <=7 only, IE <=10 - 11 only
+	// Not all browsers generate the `stack` property for `new Error()`, see also #636
+	if ( !error.stack ) {
+		try {
+			throw error;
+		} catch ( err ) {
+			error = err;
+		}
+	}
+
+	return extractStacktrace( error, offset );
+}
 
 /**
  * Config object: Maintain internal state
  * Later exposed as QUnit.config
  * `config` initialized at top of scope
  */
-config = {
+var config = {
 	// The queue of tests to run
 	queue: [],
 
@@ -110,15 +256,19 @@ config = {
 	// by default, modify document.title when suite is done
 	altertitle: true,
 
+	// HTML Reporter: collapse every test except the first failing test
+	// If false, all failing tests will be expanded
+	collapse: true,
+
 	// by default, scroll to top of the page when suite is done
 	scrolltop: true,
 
-	// when enabled, all tests must call expect()
-	requireExpects: false,
-
 	// depth up-to which object will be dumped
 	maxDepth: 5,
 
+	// when enabled, all tests must call expect()
+	requireExpects: false,
+
 	// add checkboxes that are persisted in the query-string
 	// when enabled, the id is set to `true` as a `QUnit.config` property
 	urlConfig: [
@@ -131,7 +281,7 @@ config = {
 			id: "noglobals",
 			label: "Check for Globals",
 			tooltip: "Enabling this will test if any test introduces new properties on the " +
-				"`window` object. Stored as query-strings."
+				"global object (`window` in Browsers). Stored as query-strings."
 		},
 		{
 			id: "notrycatch",
@@ -144,6 +294,9 @@ config = {
 	// Set of all modules.
 	modules: [],
 
+	// Stack of nested modules
+	moduleStack: [],
+
 	// The first unnamed module
 	currentModule: {
 		name: "",
@@ -153,75 +306,162 @@ config = {
 	callbacks: {}
 };
 
+var urlParams = defined.document ? getUrlParams() : {};
+
 // Push a loose unnamed module to the modules collection
 config.modules.push( config.currentModule );
 
-// Initialize more QUnit.config and QUnit.urlParams
-(function() {
-	var i, current,
-		location = window.location || { search: "", protocol: "file:" },
-		params = location.search.slice( 1 ).split( "&" ),
-		length = params.length,
-		urlParams = {};
+if ( urlParams.filter === true ) {
+	delete urlParams.filter;
+}
 
-	if ( params[ 0 ] ) {
-		for ( i = 0; i < length; i++ ) {
-			current = params[ i ].split( "=" );
-			current[ 0 ] = decodeURIComponent( current[ 0 ] );
+// String search anywhere in moduleName+testName
+config.filter = urlParams.filter;
 
-			// allow just a key to turn on a flag, e.g., test.html?noglobals
-			current[ 1 ] = current[ 1 ] ? decodeURIComponent( current[ 1 ] ) : true;
-			if ( urlParams[ current[ 0 ] ] ) {
-				urlParams[ current[ 0 ] ] = [].concat( urlParams[ current[ 0 ] ], current[ 1 ] );
-			} else {
-				urlParams[ current[ 0 ] ] = current[ 1 ];
+config.testId = [];
+if ( urlParams.testId ) {
+	// Ensure that urlParams.testId is an array
+	urlParams.testId = decodeURIComponent( urlParams.testId ).split( "," );
+	for (var i = 0; i < urlParams.testId.length; i++ ) {
+		config.testId.push( urlParams.testId[ i ] );
+	}
+}
+
+var loggingCallbacks = {};
+
+// Register logging callbacks
+function registerLoggingCallbacks( obj ) {
+	var i, l, key,
+		callbackNames = [ "begin", "done", "log", "testStart", "testDone",
+			"moduleStart", "moduleDone" ];
+
+	function registerLoggingCallback( key ) {
+		var loggingCallback = function( callback ) {
+			if ( objectType( callback ) !== "function" ) {
+				throw new Error(
+					"QUnit logging methods require a callback function as their first parameters."
+				);
 			}
+
+			config.callbacks[ key ].push( callback );
+		};
+
+		// DEPRECATED: This will be removed on QUnit 2.0.0+
+		// Stores the registered functions allowing restoring
+		// at verifyLoggingCallbacks() if modified
+		loggingCallbacks[ key ] = loggingCallback;
+
+		return loggingCallback;
+	}
+
+	for ( i = 0, l = callbackNames.length; i < l; i++ ) {
+		key = callbackNames[ i ];
+
+		// Initialize key collection of logging callback
+		if ( objectType( config.callbacks[ key ] ) === "undefined" ) {
+			config.callbacks[ key ] = [];
 		}
+
+		obj[ key ] = registerLoggingCallback( key );
 	}
+}
+
+function runLoggingCallbacks( key, args ) {
+	var i, l, callbacks;
 
-	if ( urlParams.filter === true ) {
-		delete urlParams.filter;
+	callbacks = config.callbacks[ key ];
+	for ( i = 0, l = callbacks.length; i < l; i++ ) {
+		callbacks[ i ]( args );
 	}
+}
 
-	QUnit.urlParams = urlParams;
+// DEPRECATED: This will be removed on 2.0.0+
+// This function verifies if the loggingCallbacks were modified by the user
+// If so, it will restore it, assign the given callback and print a console warning
+function verifyLoggingCallbacks() {
+	var loggingCallback, userCallback;
 
-	// String search anywhere in moduleName+testName
-	config.filter = urlParams.filter;
+	for ( loggingCallback in loggingCallbacks ) {
+		if ( QUnit[ loggingCallback ] !== loggingCallbacks[ loggingCallback ] ) {
 
-	if ( urlParams.maxDepth ) {
-		config.maxDepth = parseInt( urlParams.maxDepth, 10 ) === -1 ?
-			Number.POSITIVE_INFINITY :
-			urlParams.maxDepth;
-	}
+			userCallback = QUnit[ loggingCallback ];
 
-	config.testId = [];
-	if ( urlParams.testId ) {
+			// Restore the callback function
+			QUnit[ loggingCallback ] = loggingCallbacks[ loggingCallback ];
+
+			// Assign the deprecated given callback
+			QUnit[ loggingCallback ]( userCallback );
 
-		// Ensure that urlParams.testId is an array
-		urlParams.testId = decodeURIComponent( urlParams.testId ).split( "," );
-		for ( i = 0; i < urlParams.testId.length; i++ ) {
-			config.testId.push( urlParams.testId[ i ] );
+			if ( global.console && global.console.warn ) {
+				global.console.warn(
+					"QUnit." + loggingCallback + " was replaced with a new value.\n" +
+					"Please, check out the documentation on how to apply logging callbacks.\n" +
+					"Reference: http://api.qunitjs.com/category/callbacks/"
+				);
+			}
 		}
 	}
+}
+
+( function() {
+	if ( !defined.document ) {
+		return;
+	}
 
-	// Figure out if we're running the tests from a server or not
-	QUnit.isLocal = location.protocol === "file:";
+	// `onErrorFnPrev` initialized at top of scope
+	// Preserve other handlers
+	var onErrorFnPrev = window.onerror;
+
+	// Cover uncaught exceptions
+	// Returning true will suppress the default browser handler,
+	// returning false will let it run.
+	window.onerror = function( error, filePath, linerNr ) {
+		var ret = false;
+		if ( onErrorFnPrev ) {
+			ret = onErrorFnPrev( error, filePath, linerNr );
+		}
 
-	// Expose the current QUnit version
-	QUnit.version = "1.18.0";
-}());
+		// Treat return value as window.onerror itself does,
+		// Only do our handling if not suppressed.
+		if ( ret !== true ) {
+			if ( QUnit.config.current ) {
+				if ( QUnit.config.current.ignoreGlobalErrors ) {
+					return true;
+				}
+				QUnit.pushFailure( error, filePath + ":" + linerNr );
+			} else {
+				QUnit.test( "global failure", extend(function() {
+					QUnit.pushFailure( error, filePath + ":" + linerNr );
+				}, { validTest: true } ) );
+			}
+			return false;
+		}
+
+		return ret;
+	};
+} )();
+
+QUnit.urlParams = urlParams;
+
+// Figure out if we're running the tests from a server or not
+QUnit.isLocal = !( defined.document && window.location.protocol !== "file:" );
+
+// Expose the current QUnit version
+QUnit.version = "1.20.0";
 
-// Root QUnit object.
-// `QUnit` initialized at top of scope
 extend( QUnit, {
 
 	// call on start of module test to prepend name to all tests
-	module: function( name, testEnvironment ) {
-		var currentModule = {
-			name: name,
-			testEnvironment: testEnvironment,
-			tests: []
-		};
+	module: function( name, testEnvironment, executeNow ) {
+		var module, moduleFns;
+		var currentModule = config.currentModule;
+
+		if ( arguments.length === 2 ) {
+			if ( testEnvironment instanceof Function ) {
+				executeNow = testEnvironment;
+				testEnvironment = undefined;
+			}
+		}
 
 		// DEPRECATED: handles setup/teardown functions,
 		// beforeEach and afterEach should be used instead
@@ -234,46 +474,61 @@ extend( QUnit, {
 			delete testEnvironment.teardown;
 		}
 
-		config.modules.push( currentModule );
-		config.currentModule = currentModule;
-	},
+		module = createModule();
 
-	// DEPRECATED: QUnit.asyncTest() will be removed in QUnit 2.0.
-	asyncTest: function( testName, expected, callback ) {
-		if ( arguments.length === 2 ) {
-			callback = expected;
-			expected = null;
+		moduleFns = {
+			beforeEach: setHook( module, "beforeEach" ),
+			afterEach: setHook( module, "afterEach" )
+		};
+
+		if ( executeNow instanceof Function ) {
+			config.moduleStack.push( module );
+			setCurrentModule( module );
+			executeNow.call( module.testEnvironment, moduleFns );
+			config.moduleStack.pop();
+			module = module.parentModule || currentModule;
 		}
 
-		QUnit.test( testName, expected, callback, true );
-	},
+		setCurrentModule( module );
+
+		function createModule() {
+			var parentModule = config.moduleStack.length ?
+				config.moduleStack.slice( -1 )[ 0 ] : null;
+			var moduleName = parentModule !== null ?
+				[ parentModule.name, name ].join( " > " ) : name;
+			var module = {
+				name: moduleName,
+				parentModule: parentModule,
+				tests: []
+			};
 
-	test: function( testName, expected, callback, async ) {
-		var test;
+			var env = {};
+			if ( parentModule ) {
+				extend( env, parentModule.testEnvironment );
+				delete env.beforeEach;
+				delete env.afterEach;
+			}
+			extend( env, testEnvironment );
+			module.testEnvironment = env;
 
-		if ( arguments.length === 2 ) {
-			callback = expected;
-			expected = null;
+			config.modules.push( module );
+			return module;
 		}
 
-		test = new Test({
-			testName: testName,
-			expected: expected,
-			async: async,
-			callback: callback
-		});
+		function setCurrentModule( module ) {
+			config.currentModule = module;
+		}
 
-		test.queue();
 	},
 
-	skip: function( testName ) {
-		var test = new Test({
-			testName: testName,
-			skip: true
-		});
+	// DEPRECATED: QUnit.asyncTest() will be removed in QUnit 2.0.
+	asyncTest: asyncTest,
 
-		test.queue();
-	},
+	test: test,
+
+	skip: skip,
+
+	only: only,
 
 	// DEPRECATED: The functionality of QUnit.start() will be altered in QUnit 2.0.
 	// In QUnit 2.0, invoking it will ONLY affect the `QUnit.config.autostart` blocking behavior.
@@ -301,6 +556,17 @@ extend( QUnit, {
 			// If a test is running, adjust its semaphore
 			config.current.semaphore -= count || 1;
 
+			// If semaphore is non-numeric, throw error
+			if ( isNaN( config.current.semaphore ) ) {
+				config.current.semaphore = 0;
+
+				QUnit.pushFailure(
+					"Called start() with a non-numeric decrement.",
+					sourceFromStacktrace( 2 )
+				);
+				return;
+			}
+
 			// Don't start until equal number of stop-calls
 			if ( config.current.semaphore > 0 ) {
 				return;
@@ -337,43 +603,9 @@ extend( QUnit, {
 
 	config: config,
 
-	// Safe object type checking
-	is: function( type, obj ) {
-		return QUnit.objectType( obj ) === type;
-	},
-
-	objectType: function( obj ) {
-		if ( typeof obj === "undefined" ) {
-			return "undefined";
-		}
+	is: is,
 
-		// Consider: typeof null === object
-		if ( obj === null ) {
-			return "null";
-		}
-
-		var match = toString.call( obj ).match( /^\[object\s(.*)\]$/ ),
-			type = match && match[ 1 ] || "";
-
-		switch ( type ) {
-			case "Number":
-				if ( isNaN( obj ) ) {
-					return "nan";
-				}
-				return "number";
-			case "String":
-			case "Boolean":
-			case "Array":
-			case "Date":
-			case "RegExp":
-			case "Function":
-				return type.toLowerCase();
-		}
-		if ( typeof obj === "object" ) {
-			return "object";
-		}
-		return undefined;
-	},
+	objectType: objectType,
 
 	extend: extend,
 
@@ -395,174 +627,50 @@ extend( QUnit, {
 		if ( config.autostart ) {
 			resumeProcessing();
 		}
+	},
+
+	stack: function( offset ) {
+		offset = ( offset || 0 ) + 2;
+		return sourceFromStacktrace( offset );
 	}
 });
 
-// Register logging callbacks
-(function() {
-	var i, l, key,
-		callbacks = [ "begin", "done", "log", "testStart", "testDone",
-			"moduleStart", "moduleDone" ];
-
-	function registerLoggingCallback( key ) {
-		var loggingCallback = function( callback ) {
-			if ( QUnit.objectType( callback ) !== "function" ) {
-				throw new Error(
-					"QUnit logging methods require a callback function as their first parameters."
-				);
-			}
+registerLoggingCallbacks( QUnit );
 
-			config.callbacks[ key ].push( callback );
-		};
+function begin() {
+	var i, l,
+		modulesLog = [];
 
-		// DEPRECATED: This will be removed on QUnit 2.0.0+
-		// Stores the registered functions allowing restoring
-		// at verifyLoggingCallbacks() if modified
-		loggingCallbacks[ key ] = loggingCallback;
+	// If the test run hasn't officially begun yet
+	if ( !config.started ) {
 
-		return loggingCallback;
-	}
+		// Record the time of the test run's beginning
+		config.started = now();
 
-	for ( i = 0, l = callbacks.length; i < l; i++ ) {
-		key = callbacks[ i ];
+		verifyLoggingCallbacks();
 
-		// Initialize key collection of logging callback
-		if ( QUnit.objectType( config.callbacks[ key ] ) === "undefined" ) {
-			config.callbacks[ key ] = [];
+		// Delete the loose unnamed module if unused.
+		if ( config.modules[ 0 ].name === "" && config.modules[ 0 ].tests.length === 0 ) {
+			config.modules.shift();
 		}
 
-		QUnit[ key ] = registerLoggingCallback( key );
-	}
-})();
-
-// `onErrorFnPrev` initialized at top of scope
-// Preserve other handlers
-onErrorFnPrev = window.onerror;
-
-// Cover uncaught exceptions
-// Returning true will suppress the default browser handler,
-// returning false will let it run.
-window.onerror = function( error, filePath, linerNr ) {
-	var ret = false;
-	if ( onErrorFnPrev ) {
-		ret = onErrorFnPrev( error, filePath, linerNr );
-	}
-
-	// Treat return value as window.onerror itself does,
-	// Only do our handling if not suppressed.
-	if ( ret !== true ) {
-		if ( QUnit.config.current ) {
-			if ( QUnit.config.current.ignoreGlobalErrors ) {
-				return true;
-			}
-			QUnit.pushFailure( error, filePath + ":" + linerNr );
-		} else {
-			QUnit.test( "global failure", extend(function() {
-				QUnit.pushFailure( error, filePath + ":" + linerNr );
-			}, { validTest: true } ) );
+		// Avoid unnecessary information by not logging modules' test environments
+		for ( i = 0, l = config.modules.length; i < l; i++ ) {
+			modulesLog.push({
+				name: config.modules[ i ].name,
+				tests: config.modules[ i ].tests
+			});
 		}
-		return false;
-	}
-
-	return ret;
-};
 
-function done() {
-	var runtime, passed;
-
-	config.autorun = true;
-
-	// Log the last module results
-	if ( config.previousModule ) {
-		runLoggingCallbacks( "moduleDone", {
-			name: config.previousModule.name,
-			tests: config.previousModule.tests,
-			failed: config.moduleStats.bad,
-			passed: config.moduleStats.all - config.moduleStats.bad,
-			total: config.moduleStats.all,
-			runtime: now() - config.moduleStats.started
+		// The test run is officially beginning now
+		runLoggingCallbacks( "begin", {
+			totalTests: Test.count,
+			modules: modulesLog
 		});
 	}
-	delete config.previousModule;
-
-	runtime = now() - config.started;
-	passed = config.stats.all - config.stats.bad;
-
-	runLoggingCallbacks( "done", {
-		failed: config.stats.bad,
-		passed: passed,
-		total: config.stats.all,
-		runtime: runtime
-	});
-}
-
-// Doesn't support IE6 to IE9, it will return undefined on these browsers
-// See also https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error/Stack
-function extractStacktrace( e, offset ) {
-	offset = offset === undefined ? 4 : offset;
-
-	var stack, include, i;
-
-	if ( e.stack ) {
-		stack = e.stack.split( "\n" );
-		if ( /^error$/i.test( stack[ 0 ] ) ) {
-			stack.shift();
-		}
-		if ( fileName ) {
-			include = [];
-			for ( i = offset; i < stack.length; i++ ) {
-				if ( stack[ i ].indexOf( fileName ) !== -1 ) {
-					break;
-				}
-				include.push( stack[ i ] );
-			}
-			if ( include.length ) {
-				return include.join( "\n" );
-			}
-		}
-		return stack[ offset ];
-
-	// Support: Safari <=6 only
-	} else if ( e.sourceURL ) {
-
-		// exclude useless self-reference for generated Error objects
-		if ( /qunit.js$/.test( e.sourceURL ) ) {
-			return;
-		}
-
-		// for actual exceptions, this is useful
-		return e.sourceURL + ":" + e.line;
-	}
-}
-
-function sourceFromStacktrace( offset ) {
-	var error = new Error();
-
-	// Support: Safari <=7 only, IE <=10 - 11 only
-	// Not all browsers generate the `stack` property for `new Error()`, see also #636
-	if ( !error.stack ) {
-		try {
-			throw error;
-		} catch ( err ) {
-			error = err;
-		}
-	}
-
-	return extractStacktrace( error, offset );
-}
-
-function synchronize( callback, last ) {
-	if ( QUnit.objectType( callback ) === "array" ) {
-		while ( callback.length ) {
-			synchronize( callback.shift() );
-		}
-		return;
-	}
-	config.queue.push( callback );
 
-	if ( config.autorun && !config.blocking ) {
-		process( last );
-	}
+	config.blocking = false;
+	process( true );
 }
 
 function process( last ) {
@@ -592,40 +700,21 @@ function process( last ) {
 	}
 }
 
-function begin() {
-	var i, l,
-		modulesLog = [];
-
-	// If the test run hasn't officially begun yet
-	if ( !config.started ) {
-
-		// Record the time of the test run's beginning
-		config.started = now();
-
-		verifyLoggingCallbacks();
-
-		// Delete the loose unnamed module if unused.
-		if ( config.modules[ 0 ].name === "" && config.modules[ 0 ].tests.length === 0 ) {
-			config.modules.shift();
-		}
-
-		// Avoid unnecessary information by not logging modules' test environments
-		for ( i = 0, l = config.modules.length; i < l; i++ ) {
-			modulesLog.push({
-				name: config.modules[ i ].name,
-				tests: config.modules[ i ].tests
-			});
-		}
+function pauseProcessing() {
+	config.blocking = true;
 
-		// The test run is officially beginning now
-		runLoggingCallbacks( "begin", {
-			totalTests: Test.count,
-			modules: modulesLog
-		});
+	if ( config.testTimeout && defined.setTimeout ) {
+		clearTimeout( config.timeout );
+		config.timeout = setTimeout(function() {
+			if ( config.current ) {
+				config.current.semaphore = 0;
+				QUnit.pushFailure( "Test timed out", sourceFromStacktrace( 2 ) );
+			} else {
+				throw new Error( "Test timed out" );
+			}
+			resumeProcessing();
+		}, config.testTimeout );
 	}
-
-	config.blocking = false;
-	process( true );
 }
 
 function resumeProcessing() {
@@ -648,143 +737,46 @@ function resumeProcessing() {
 	}
 }
 
-function pauseProcessing() {
-	config.blocking = true;
-
-	if ( config.testTimeout && defined.setTimeout ) {
-		clearTimeout( config.timeout );
-		config.timeout = setTimeout(function() {
-			if ( config.current ) {
-				config.current.semaphore = 0;
-				QUnit.pushFailure( "Test timed out", sourceFromStacktrace( 2 ) );
-			} else {
-				throw new Error( "Test timed out" );
-			}
-			resumeProcessing();
-		}, config.testTimeout );
-	}
-}
-
-function saveGlobal() {
-	config.pollution = [];
-
-	if ( config.noglobals ) {
-		for ( var key in window ) {
-			if ( hasOwn.call( window, key ) ) {
-				// in Opera sometimes DOM element ids show up here, ignore them
-				if ( /^qunit-test-output/.test( key ) ) {
-					continue;
-				}
-				config.pollution.push( key );
-			}
-		}
-	}
-}
-
-function checkPollution() {
-	var newGlobals,
-		deletedGlobals,
-		old = config.pollution;
-
-	saveGlobal();
-
-	newGlobals = diff( config.pollution, old );
-	if ( newGlobals.length > 0 ) {
-		QUnit.pushFailure( "Introduced global variable(s): " + newGlobals.join( ", " ) );
-	}
-
-	deletedGlobals = diff( old, config.pollution );
-	if ( deletedGlobals.length > 0 ) {
-		QUnit.pushFailure( "Deleted global variable(s): " + deletedGlobals.join( ", " ) );
-	}
-}
+function done() {
+	var runtime, passed;
 
-// returns a new Array with the elements that are in a but not in b
-function diff( a, b ) {
-	var i, j,
-		result = a.slice();
+	config.autorun = true;
 
-	for ( i = 0; i < result.length; i++ ) {
-		for ( j = 0; j < b.length; j++ ) {
-			if ( result[ i ] === b[ j ] ) {
-				result.splice( i, 1 );
-				i--;
-				break;
-			}
-		}
+	// Log the last module results
+	if ( config.previousModule ) {
+		runLoggingCallbacks( "moduleDone", {
+			name: config.previousModule.name,
+			tests: config.previousModule.tests,
+			failed: config.moduleStats.bad,
+			passed: config.moduleStats.all - config.moduleStats.bad,
+			total: config.moduleStats.all,
+			runtime: now() - config.moduleStats.started
+		});
 	}
-	return result;
-}
-
-function extend( a, b, undefOnly ) {
-	for ( var prop in b ) {
-		if ( hasOwn.call( b, prop ) ) {
+	delete config.previousModule;
 
-			// Avoid "Member not found" error in IE8 caused by messing with window.constructor
-			if ( !( prop === "constructor" && a === window ) ) {
-				if ( b[ prop ] === undefined ) {
-					delete a[ prop ];
-				} else if ( !( undefOnly && typeof a[ prop ] !== "undefined" ) ) {
-					a[ prop ] = b[ prop ];
-				}
-			}
-		}
-	}
+	runtime = now() - config.started;
+	passed = config.stats.all - config.stats.bad;
 
-	return a;
+	runLoggingCallbacks( "done", {
+		failed: config.stats.bad,
+		passed: passed,
+		total: config.stats.all,
+		runtime: runtime
+	});
 }
 
-function runLoggingCallbacks( key, args ) {
-	var i, l, callbacks;
-
-	callbacks = config.callbacks[ key ];
-	for ( i = 0, l = callbacks.length; i < l; i++ ) {
-		callbacks[ i ]( args );
+function setHook( module, hookName ) {
+	if ( module.testEnvironment === undefined ) {
+		module.testEnvironment = {};
 	}
-}
-
-// DEPRECATED: This will be removed on 2.0.0+
-// This function verifies if the loggingCallbacks were modified by the user
-// If so, it will restore it, assign the given callback and print a console warning
-function verifyLoggingCallbacks() {
-	var loggingCallback, userCallback;
 
-	for ( loggingCallback in loggingCallbacks ) {
-		if ( QUnit[ loggingCallback ] !== loggingCallbacks[ loggingCallback ] ) {
-
-			userCallback = QUnit[ loggingCallback ];
-
-			// Restore the callback function
-			QUnit[ loggingCallback ] = loggingCallbacks[ loggingCallback ];
-
-			// Assign the deprecated given callback
-			QUnit[ loggingCallback ]( userCallback );
-
-			if ( window.console && window.console.warn ) {
-				window.console.warn(
-					"QUnit." + loggingCallback + " was replaced with a new value.\n" +
-					"Please, check out the documentation on how to apply logging callbacks.\n" +
-					"Reference: http://api.qunitjs.com/category/callbacks/"
-				);
-			}
-		}
-	}
+	return function( callback ) {
+		module.testEnvironment[ hookName ] = callback;
+	};
 }
 
-// from jquery.js
-function inArray( elem, array ) {
-	if ( array.indexOf ) {
-		return array.indexOf( elem );
-	}
-
-	for ( var i = 0, length = array.length; i < length; i++ ) {
-		if ( array[ i ] === elem ) {
-			return i;
-		}
-	}
-
-	return -1;
-}
+var focused = false;
 
 function Test( settings ) {
 	var i, l;
@@ -858,9 +850,11 @@ Test.prototype = {
 
 		config.current = this;
 
+		if ( this.module.testEnvironment ) {
+			delete this.module.testEnvironment.beforeEach;
+			delete this.module.testEnvironment.afterEach;
+		}
 		this.testEnvironment = extend( {}, this.module.testEnvironment );
-		delete this.testEnvironment.beforeEach;
-		delete this.testEnvironment.afterEach;
 
 		this.started = now();
 		runLoggingCallbacks( "testStart", {
@@ -886,14 +880,12 @@ Test.prototype = {
 		this.callbackStarted = now();
 
 		if ( config.notrycatch ) {
-			promise = this.callback.call( this.testEnvironment, this.assert );
-			this.resolvePromise( promise );
+			runTest( this );
 			return;
 		}
 
 		try {
-			promise = this.callback.call( this.testEnvironment, this.assert );
-			this.resolvePromise( promise );
+			runTest( this );
 		} catch ( e ) {
 			this.pushFailure( "Died on test #" + ( this.assertions.length + 1 ) + " " +
 				this.stack + ": " + ( e.message || e ), extractStacktrace( e, 0 ) );
@@ -906,6 +898,11 @@ Test.prototype = {
 				QUnit.start();
 			}
 		}
+
+		function runTest( test ) {
+			promise = test.callback.call( test.testEnvironment, test.assert );
+			test.resolvePromise( promise );
+		}
 	},
 
 	after: function() {
@@ -918,16 +915,19 @@ Test.prototype = {
 		return function runHook() {
 			config.current = test;
 			if ( config.notrycatch ) {
-				promise = hook.call( test.testEnvironment, test.assert );
-				test.resolvePromise( promise, hookName );
+				callHook();
 				return;
 			}
 			try {
-				promise = hook.call( test.testEnvironment, test.assert );
-				test.resolvePromise( promise, hookName );
+				callHook();
 			} catch ( error ) {
 				test.pushFailure( hookName + " failed on " + test.testName + ": " +
-					( error.message || error ), extractStacktrace( error, 0 ) );
+				( error.message || error ), extractStacktrace( error, 0 ) );
+			}
+
+			function callHook() {
+				promise = hook.call( test.testEnvironment, test.assert );
+				test.resolvePromise( promise, hookName );
 			}
 		};
 	},
@@ -936,16 +936,20 @@ Test.prototype = {
 	hooks: function( handler ) {
 		var hooks = [];
 
-		// Hooks are ignored on skipped tests
-		if ( this.skip ) {
-			return hooks;
+		function processHooks( test, module ) {
+			if ( module.parentModule ) {
+				processHooks( test, module.parentModule );
+			}
+			if ( module.testEnvironment &&
+				QUnit.objectType( module.testEnvironment[ handler ] ) === "function" ) {
+				hooks.push( test.queueHook( module.testEnvironment[ handler ], handler ) );
+			}
 		}
 
-		if ( this.module.testEnvironment &&
-				QUnit.objectType( this.module.testEnvironment[ handler ] ) === "function" ) {
-			hooks.push( this.queueHook( this.module.testEnvironment[ handler ], handler ) );
+		// Hooks are ignored on skipped tests
+		if ( !this.skip ) {
+			processHooks( this, this.module );
 		}
-
 		return hooks;
 	},
 
@@ -990,6 +994,9 @@ Test.prototype = {
 			assertions: this.assertions,
 			testId: this.testId,
 
+			// Source of Test
+			source: this.stack,
+
 			// DEPRECATED: this property will be removed in 2.0.0, use runtime instead
 			duration: this.runtime
 		});
@@ -1003,7 +1010,7 @@ Test.prototype = {
 	},
 
 	queue: function() {
-		var bad,
+		var priority,
 			test = this;
 
 		if ( !this.valid() ) {
@@ -1019,7 +1026,6 @@ Test.prototype = {
 				},
 
 				test.hooks( "beforeEach" ),
-
 				function() {
 					test.run();
 				},
@@ -1035,19 +1041,14 @@ Test.prototype = {
 			]);
 		}
 
-		// `bad` initialized at top of scope
-		// defer when previous test run passed, if storage is available
-		bad = QUnit.config.reorder && defined.sessionStorage &&
+		// Prioritize previously failed tests, detected from sessionStorage
+		priority = QUnit.config.reorder && defined.sessionStorage &&
 				+sessionStorage.getItem( "qunit-test-" + this.module.name + "-" + this.testName );
 
-		if ( bad ) {
-			run();
-		} else {
-			synchronize( run, true );
-		}
+		return synchronize( run, priority );
 	},
 
-	push: function( result, actual, expected, message ) {
+	push: function( result, actual, expected, message, negative ) {
 		var source,
 			details = {
 				module: this.module.name,
@@ -1057,6 +1058,7 @@ Test.prototype = {
 				actual: actual,
 				expected: expected,
 				testId: this.testId,
+				negative: negative || false,
 				runtime: now() - this.started
 			};
 
@@ -1077,7 +1079,7 @@ Test.prototype = {
 	},
 
 	pushFailure: function( message, source, actual ) {
-		if ( !this instanceof Test ) {
+		if ( !( this instanceof Test ) ) {
 			throw new Error( "pushFailure() assertion outside test context, was " +
 				sourceFromStacktrace( 2 ) );
 		}
@@ -1113,7 +1115,7 @@ Test.prototype = {
 				QUnit.stop();
 				then.call(
 					promise,
-					QUnit.start,
+					function() { QUnit.start(); },
 					function( error ) {
 						message = "Promise rejected " +
 							( !phase ? "during" : phase.replace( /Each$/, "" ) ) +
@@ -1137,6 +1139,17 @@ Test.prototype = {
 			module = QUnit.urlParams.module && QUnit.urlParams.module.toLowerCase(),
 			fullName = ( this.module.name + ": " + this.testName ).toLowerCase();
 
+		function testInModuleChain( testModule ) {
+			var testModuleName = testModule.name ? testModule.name.toLowerCase() : null;
+			if ( testModuleName === module ) {
+				return true;
+			} else if ( testModule.parentModule ) {
+				return testInModuleChain( testModule.parentModule );
+			} else {
+				return false;
+			}
+		}
+
 		// Internally-generated tests are always valid
 		if ( this.callback && this.callback.validTest ) {
 			return true;
@@ -1146,7 +1159,7 @@ Test.prototype = {
 			return false;
 		}
 
-		if ( module && ( !this.module.name || this.module.name.toLowerCase() !== module ) ) {
+		if ( module && !testInModuleChain( this.module ) ) {
 			return false;
 		}
 
@@ -1167,7 +1180,6 @@ Test.prototype = {
 		// Otherwise, do the opposite
 		return !include;
 	}
-
 };
 
 // Resets the test setup. Useful for tests that modify the DOM.
@@ -1180,7 +1192,7 @@ QUnit.reset = function() {
 
 	// Return on non-browser environments
 	// This is necessary to not break on node tests
-	if ( typeof window === "undefined" ) {
+	if ( !defined.document ) {
 		return;
 	}
 
@@ -1228,6 +1240,145 @@ function generateHash( module, testName ) {
 	return hex.slice( -8 );
 }
 
+function synchronize( callback, priority ) {
+	var last = !priority;
+
+	if ( QUnit.objectType( callback ) === "array" ) {
+		while ( callback.length ) {
+			synchronize( callback.shift() );
+		}
+		return;
+	}
+
+	if ( priority ) {
+		priorityFill( callback );
+	} else {
+		config.queue.push( callback );
+	}
+
+	if ( config.autorun && !config.blocking ) {
+		process( last );
+	}
+}
+
+// Place previously failed tests on a queue priority line, respecting the order they get assigned.
+function priorityFill( callback ) {
+	var queue, prioritizedQueue;
+
+	queue = config.queue.slice( priorityFill.pos );
+	prioritizedQueue = config.queue.slice( 0, -config.queue.length + priorityFill.pos );
+
+	queue.unshift( callback );
+	queue.unshift.apply( queue, prioritizedQueue );
+
+	config.queue = queue;
+
+	priorityFill.pos += 1;
+}
+priorityFill.pos = 0;
+
+function saveGlobal() {
+	config.pollution = [];
+
+	if ( config.noglobals ) {
+		for ( var key in global ) {
+			if ( hasOwn.call( global, key ) ) {
+
+				// in Opera sometimes DOM element ids show up here, ignore them
+				if ( /^qunit-test-output/.test( key ) ) {
+					continue;
+				}
+				config.pollution.push( key );
+			}
+		}
+	}
+}
+
+function checkPollution() {
+	var newGlobals,
+		deletedGlobals,
+		old = config.pollution;
+
+	saveGlobal();
+
+	newGlobals = diff( config.pollution, old );
+	if ( newGlobals.length > 0 ) {
+		QUnit.pushFailure( "Introduced global variable(s): " + newGlobals.join( ", " ) );
+	}
+
+	deletedGlobals = diff( old, config.pollution );
+	if ( deletedGlobals.length > 0 ) {
+		QUnit.pushFailure( "Deleted global variable(s): " + deletedGlobals.join( ", " ) );
+	}
+}
+
+// Will be exposed as QUnit.asyncTest
+function asyncTest( testName, expected, callback ) {
+	if ( arguments.length === 2 ) {
+		callback = expected;
+		expected = null;
+	}
+
+	QUnit.test( testName, expected, callback, true );
+}
+
+// Will be exposed as QUnit.test
+function test( testName, expected, callback, async ) {
+	if ( focused )  { return; }
+
+	var newTest;
+
+	if ( arguments.length === 2 ) {
+		callback = expected;
+		expected = null;
+	}
+
+	newTest = new Test({
+		testName: testName,
+		expected: expected,
+		async: async,
+		callback: callback
+	});
+
+	newTest.queue();
+}
+
+// Will be exposed as QUnit.skip
+function skip( testName ) {
+	if ( focused )  { return; }
+
+	var test = new Test({
+		testName: testName,
+		skip: true
+	});
+
+	test.queue();
+}
+
+// Will be exposed as QUnit.only
+function only( testName, expected, callback, async ) {
+	var newTest;
+
+	if ( focused )  { return; }
+
+	QUnit.config.queue.length = 0;
+	focused = true;
+
+	if ( arguments.length === 2 ) {
+		callback = expected;
+		expected = null;
+	}
+
+	newTest = new Test({
+		testName: testName,
+		expected: expected,
+		async: async,
+		callback: callback
+	});
+
+	newTest.queue();
+}
+
 function Assert( testContext ) {
 	this.test = testContext;
 }
@@ -1245,30 +1396,41 @@ QUnit.assert = Assert.prototype = {
 		}
 	},
 
-	// Increment this Test's semaphore counter, then return a single-use function that
+	// Increment this Test's semaphore counter, then return a function that
 	// decrements that counter a maximum of once.
-	async: function() {
+	async: function( count ) {
 		var test = this.test,
-			popped = false;
+			popped = false,
+			acceptCallCount = count;
+
+		if ( typeof acceptCallCount === "undefined" ) {
+			acceptCallCount = 1;
+		}
 
 		test.semaphore += 1;
 		test.usedAsync = true;
 		pauseProcessing();
 
 		return function done() {
-			if ( !popped ) {
-				test.semaphore -= 1;
-				popped = true;
-				resumeProcessing();
-			} else {
-				test.pushFailure( "Called the callback returned from `assert.async` more than once",
+
+			if ( popped ) {
+				test.pushFailure( "Too many calls to the `assert.async` callback",
 					sourceFromStacktrace( 2 ) );
+				return;
+			}
+			acceptCallCount -= 1;
+			if ( acceptCallCount > 0 ) {
+				return;
 			}
+
+			test.semaphore -= 1;
+			popped = true;
+			resumeProcessing();
 		};
 	},
 
 	// Exports test.push() to the user API
-	push: function( /* result, actual, expected, message */ ) {
+	push: function( /* result, actual, expected, message, negative */ ) {
 		var assert = this,
 			currentTest = ( assert instanceof Assert && assert.test ) || QUnit.config.current;
 
@@ -1303,7 +1465,7 @@ QUnit.assert = Assert.prototype = {
 	notOk: function( result, message ) {
 		message = message || ( !result ? "okay" : "failed, expected argument to be falsy, was: " +
 			QUnit.dump.parse( result ) );
-		this.push( !result, result, false, message );
+		this.push( !result, result, false, message, true );
 	},
 
 	equal: function( actual, expected, message ) {
@@ -1313,7 +1475,7 @@ QUnit.assert = Assert.prototype = {
 
 	notEqual: function( actual, expected, message ) {
 		/*jshint eqeqeq:false */
-		this.push( expected != actual, actual, expected, message );
+		this.push( expected != actual, actual, expected, message, true );
 	},
 
 	propEqual: function( actual, expected, message ) {
@@ -1325,7 +1487,7 @@ QUnit.assert = Assert.prototype = {
 	notPropEqual: function( actual, expected, message ) {
 		actual = objectValues( actual );
 		expected = objectValues( expected );
-		this.push( !QUnit.equiv( actual, expected ), actual, expected, message );
+		this.push( !QUnit.equiv( actual, expected ), actual, expected, message, true );
 	},
 
 	deepEqual: function( actual, expected, message ) {
@@ -1333,7 +1495,7 @@ QUnit.assert = Assert.prototype = {
 	},
 
 	notDeepEqual: function( actual, expected, message ) {
-		this.push( !QUnit.equiv( actual, expected ), actual, expected, message );
+		this.push( !QUnit.equiv( actual, expected ), actual, expected, message, true );
 	},
 
 	strictEqual: function( actual, expected, message ) {
@@ -1341,7 +1503,7 @@ QUnit.assert = Assert.prototype = {
 	},
 
 	notStrictEqual: function( actual, expected, message ) {
-		this.push( expected !== actual, actual, expected, message );
+		this.push( expected !== actual, actual, expected, message, true );
 	},
 
 	"throws": function( block, expected, message ) {
@@ -1401,229 +1563,305 @@ QUnit.assert = Assert.prototype = {
 	}
 };
 
-// Provide an alternative to assert.throws(), for enviroments that consider throws a reserved word
+// Provide an alternative to assert.throws(), for environments that consider throws a reserved word
 // Known to us are: Closure Compiler, Narwhal
 (function() {
 	/*jshint sub:true */
 	Assert.prototype.raises = Assert.prototype[ "throws" ];
 }());
 
+function errorString( error ) {
+	var name, message,
+		resultErrorString = error.toString();
+	if ( resultErrorString.substring( 0, 7 ) === "[object" ) {
+		name = error.name ? error.name.toString() : "Error";
+		message = error.message ? error.message.toString() : "";
+		if ( name && message ) {
+			return name + ": " + message;
+		} else if ( name ) {
+			return name;
+		} else if ( message ) {
+			return message;
+		} else {
+			return "Error";
+		}
+	} else {
+		return resultErrorString;
+	}
+}
+
 // Test for equality any JavaScript type.
 // Author: Philippe Rathé <[email protected]>
 QUnit.equiv = (function() {
 
-	// Call the o related callback with the given arguments.
-	function bindCallbacks( o, callbacks, args ) {
-		var prop = QUnit.objectType( o );
-		if ( prop ) {
-			if ( QUnit.objectType( callbacks[ prop ] ) === "function" ) {
-				return callbacks[ prop ].apply( callbacks, args );
-			} else {
-				return callbacks[ prop ]; // or undefined
-			}
-		}
-	}
+	// Stack to decide between skip/abort functions
+	var callers = [];
+
+	// Stack to avoiding loops from circular referencing
+	var parents = [];
+	var parentsB = [];
 
-	// the real equiv function
-	var innerEquiv,
+	function useStrictEquality( b, a ) {
 
-		// stack to decide between skip/abort functions
-		callers = [],
+		/*jshint eqeqeq:false */
+		if ( b instanceof a.constructor || a instanceof b.constructor ) {
 
-		// stack to avoiding loops from circular referencing
-		parents = [],
-		parentsB = [],
+			// To catch short annotation VS 'new' annotation of a declaration. e.g.:
+			// `var i = 1;`
+			// `var j = new Number(1);`
+			return a == b;
+		} else {
+			return a === b;
+		}
+	}
 
-		getProto = Object.getPrototypeOf || function( obj ) {
-			/* jshint camelcase: false, proto: true */
+	function compareConstructors( a, b ) {
+		var getProto = Object.getPrototypeOf || function( obj ) {
+
+			/*jshint proto: true */
 			return obj.__proto__;
-		},
-		callbacks = (function() {
+		};
+		var protoA = getProto( a );
+		var protoB = getProto( b );
 
-			// for string, boolean, number and null
-			function useStrictEquality( b, a ) {
+		// Comparing constructors is more strict than using `instanceof`
+		if ( a.constructor === b.constructor ) {
+			return true;
+		}
 
-				/*jshint eqeqeq:false */
-				if ( b instanceof a.constructor || a instanceof b.constructor ) {
+		// Ref #851
+		// If the obj prototype descends from a null constructor, treat it
+		// as a null prototype.
+		if ( protoA && protoA.constructor === null ) {
+			protoA = null;
+		}
+		if ( protoB && protoB.constructor === null ) {
+			protoB = null;
+		}
 
-					// to catch short annotation VS 'new' annotation of a
-					// declaration
-					// e.g. var i = 1;
-					// var j = new Number(1);
-					return a == b;
-				} else {
-					return a === b;
-				}
-			}
+		// Allow objects with no prototype to be equivalent to
+		// objects with Object as their constructor.
+		if ( ( protoA === null && protoB === Object.prototype ) ||
+				( protoB === null && protoA === Object.prototype ) ) {
+			return true;
+		}
 
-			return {
-				"string": useStrictEquality,
-				"boolean": useStrictEquality,
-				"number": useStrictEquality,
-				"null": useStrictEquality,
-				"undefined": useStrictEquality,
+		return false;
+	}
 
-				"nan": function( b ) {
-					return isNaN( b );
-				},
+	var callbacks = {
+		"string": useStrictEquality,
+		"boolean": useStrictEquality,
+		"number": useStrictEquality,
+		"null": useStrictEquality,
+		"undefined": useStrictEquality,
+		"symbol": useStrictEquality,
 
-				"date": function( b, a ) {
-					return QUnit.objectType( b ) === "date" && a.valueOf() === b.valueOf();
-				},
+		"nan": function( b ) {
+			return isNaN( b );
+		},
 
-				"regexp": function( b, a ) {
-					return QUnit.objectType( b ) === "regexp" &&
+		"date": function( b, a ) {
+			return QUnit.objectType( b ) === "date" && a.valueOf() === b.valueOf();
+		},
 
-						// the regex itself
-						a.source === b.source &&
+		"regexp": function( b, a ) {
+			return QUnit.objectType( b ) === "regexp" &&
 
-						// and its modifiers
-						a.global === b.global &&
+				// The regex itself
+				a.source === b.source &&
 
-						// (gmi) ...
-						a.ignoreCase === b.ignoreCase &&
-						a.multiline === b.multiline &&
-						a.sticky === b.sticky;
-				},
+				// And its modifiers
+				a.global === b.global &&
 
-				// - skip when the property is a method of an instance (OOP)
-				// - abort otherwise,
-				// initial === would have catch identical references anyway
-				"function": function() {
-					var caller = callers[ callers.length - 1 ];
-					return caller !== Object && typeof caller !== "undefined";
-				},
+				// (gmi) ...
+				a.ignoreCase === b.ignoreCase &&
+				a.multiline === b.multiline &&
+				a.sticky === b.sticky;
+		},
 
-				"array": function( b, a ) {
-					var i, j, len, loop, aCircular, bCircular;
+		// - skip when the property is a method of an instance (OOP)
+		// - abort otherwise,
+		// initial === would have catch identical references anyway
+		"function": function() {
+			var caller = callers[ callers.length - 1 ];
+			return caller !== Object && typeof caller !== "undefined";
+		},
 
-					// b could be an object literal here
-					if ( QUnit.objectType( b ) !== "array" ) {
-						return false;
-					}
+		"array": function( b, a ) {
+			var i, j, len, loop, aCircular, bCircular;
 
-					len = a.length;
-					if ( len !== b.length ) {
-						// safe and faster
-						return false;
-					}
+			// b could be an object literal here
+			if ( QUnit.objectType( b ) !== "array" ) {
+				return false;
+			}
 
-					// track reference to avoid circular references
-					parents.push( a );
-					parentsB.push( b );
-					for ( i = 0; i < len; i++ ) {
-						loop = false;
-						for ( j = 0; j < parents.length; j++ ) {
-							aCircular = parents[ j ] === a[ i ];
-							bCircular = parentsB[ j ] === b[ i ];
-							if ( aCircular || bCircular ) {
-								if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
-									loop = true;
-								} else {
-									parents.pop();
-									parentsB.pop();
-									return false;
-								}
-							}
-						}
-						if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
+			len = a.length;
+			if ( len !== b.length ) {
+				// safe and faster
+				return false;
+			}
+
+			// Track reference to avoid circular references
+			parents.push( a );
+			parentsB.push( b );
+			for ( i = 0; i < len; i++ ) {
+				loop = false;
+				for ( j = 0; j < parents.length; j++ ) {
+					aCircular = parents[ j ] === a[ i ];
+					bCircular = parentsB[ j ] === b[ i ];
+					if ( aCircular || bCircular ) {
+						if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
+							loop = true;
+						} else {
 							parents.pop();
 							parentsB.pop();
 							return false;
 						}
 					}
+				}
+				if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
 					parents.pop();
 					parentsB.pop();
-					return true;
-				},
+					return false;
+				}
+			}
+			parents.pop();
+			parentsB.pop();
+			return true;
+		},
 
-				"object": function( b, a ) {
+		"set": function( b, a ) {
+			var aArray, bArray;
 
-					/*jshint forin:false */
-					var i, j, loop, aCircular, bCircular,
-						// Default to true
-						eq = true,
-						aProperties = [],
-						bProperties = [];
+			// `b` could be any object here
+			if ( QUnit.objectType( b ) !== "set" ) {
+				return false;
+			}
 
-					// comparing constructors is more strict than using
-					// instanceof
-					if ( a.constructor !== b.constructor ) {
+			aArray = [];
+			a.forEach( function( v ) {
+				aArray.push( v );
+			});
+			bArray = [];
+			b.forEach( function( v ) {
+				bArray.push( v );
+			});
 
-						// Allow objects with no prototype to be equivalent to
-						// objects with Object as their constructor.
-						if ( !( ( getProto( a ) === null && getProto( b ) === Object.prototype ) ||
-							( getProto( b ) === null && getProto( a ) === Object.prototype ) ) ) {
-							return false;
-						}
-					}
+			return innerEquiv( bArray, aArray );
+		},
 
-					// stack constructor before traversing properties
-					callers.push( a.constructor );
-
-					// track reference to avoid circular references
-					parents.push( a );
-					parentsB.push( b );
-
-					// be strict: don't ensure hasOwnProperty and go deep
-					for ( i in a ) {
-						loop = false;
-						for ( j = 0; j < parents.length; j++ ) {
-							aCircular = parents[ j ] === a[ i ];
-							bCircular = parentsB[ j ] === b[ i ];
-							if ( aCircular || bCircular ) {
-								if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
-									loop = true;
-								} else {
-									eq = false;
-									break;
-								}
-							}
-						}
-						aProperties.push( i );
-						if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
+		"map": function( b, a ) {
+			var aArray, bArray;
+
+			// `b` could be any object here
+			if ( QUnit.objectType( b ) !== "map" ) {
+				return false;
+			}
+
+			aArray = [];
+			a.forEach( function( v, k ) {
+				aArray.push( [ k, v ] );
+			});
+			bArray = [];
+			b.forEach( function( v, k ) {
+				bArray.push( [ k, v ] );
+			});
+
+			return innerEquiv( bArray, aArray );
+		},
+
+		"object": function( b, a ) {
+			var i, j, loop, aCircular, bCircular;
+
+			// Default to true
+			var eq = true;
+			var aProperties = [];
+			var bProperties = [];
+
+			if ( compareConstructors( a, b ) === false ) {
+				return false;
+			}
+
+			// Stack constructor before traversing properties
+			callers.push( a.constructor );
+
+			// Track reference to avoid circular references
+			parents.push( a );
+			parentsB.push( b );
+
+			// Be strict: don't ensure hasOwnProperty and go deep
+			for ( i in a ) {
+				loop = false;
+				for ( j = 0; j < parents.length; j++ ) {
+					aCircular = parents[ j ] === a[ i ];
+					bCircular = parentsB[ j ] === b[ i ];
+					if ( aCircular || bCircular ) {
+						if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
+							loop = true;
+						} else {
 							eq = false;
 							break;
 						}
 					}
+				}
+				aProperties.push( i );
+				if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
+					eq = false;
+					break;
+				}
+			}
 
-					parents.pop();
-					parentsB.pop();
-					callers.pop(); // unstack, we are done
+			parents.pop();
+			parentsB.pop();
 
-					for ( i in b ) {
-						bProperties.push( i ); // collect b's properties
-					}
+			// Unstack, we are done
+			callers.pop();
 
-					// Ensures identical properties name
-					return eq && innerEquiv( aProperties.sort(), bProperties.sort() );
-				}
-			};
-		}());
+			for ( i in b ) {
+
+				// Collect b's properties
+				bProperties.push( i );
+			}
 
-	innerEquiv = function() { // can take multiple arguments
+			// Ensures identical properties name
+			return eq && innerEquiv( aProperties.sort(), bProperties.sort() );
+		}
+	};
+
+	function typeEquiv( a, b ) {
+		var prop = QUnit.objectType( a );
+		return callbacks[ prop ]( b, a );
+	}
+
+	// The real equiv function
+	function innerEquiv() {
 		var args = [].slice.apply( arguments );
 		if ( args.length < 2 ) {
-			return true; // end transition
+
+			// End transition
+			return true;
 		}
 
 		return ( (function( a, b ) {
 			if ( a === b ) {
-				return true; // catch the most you can
+
+				// Catch the most you can
+				return true;
 			} else if ( a === null || b === null || typeof a === "undefined" ||
 					typeof b === "undefined" ||
 					QUnit.objectType( a ) !== QUnit.objectType( b ) ) {
 
-				// don't lose time with error prone cases
+				// Don't lose time with error prone cases
 				return false;
 			} else {
-				return bindCallbacks( a, callbacks, [ b, a ] );
+				return typeEquiv( a, b );
 			}
 
-			// apply transition with (1..n) arguments
+		// Apply transition with (1..n) arguments
 		}( args[ 0 ], args[ 1 ] ) ) &&
 			innerEquiv.apply( this, args.splice( 1, args.length - 1 ) ) );
-	};
+	}
 
 	return innerEquiv;
 }());
@@ -1632,7 +1870,7 @@ QUnit.equiv = (function() {
 // http://flesler.blogspot.com/2008/05/jsdump-pretty-dump-of-any-javascript.html
 QUnit.dump = (function() {
 	function quote( str ) {
-		return "\"" + str.toString().replace( /"/g, "\\\"" ) + "\"";
+		return "\"" + str.toString().replace( /\\/g, "\\\\" ).replace( /"/g, "\\\"" ) + "\"";
 	}
 	function literal( o ) {
 		return o + "";
@@ -1893,7 +2131,7 @@ QUnit.dump = (function() {
 QUnit.jsDump = QUnit.dump;
 
 // For browser, export only select globals
-if ( typeof window !== "undefined" ) {
+if ( defined.document ) {
 
 	// Deprecated
 	// Extend assert methods to QUnit and Global scope through Backwards compatibility
@@ -1932,7 +2170,8 @@ if ( typeof window !== "undefined" ) {
 				"notDeepEqual",
 				"strictEqual",
 				"notStrictEqual",
-				"throws"
+				"throws",
+				"raises"
 			];
 
 		for ( i = 0, l = keys.length; i < l; i++ ) {
@@ -1963,13 +2202,6 @@ if ( typeof define === "function" && define.amd ) {
 	QUnit.config.autostart = false;
 }
 
-// Get a reference to the global object, like window in browsers
-}( (function() {
-	return this;
-})() ));
-
-/*istanbul ignore next */
-// jscs:disable maximumLineLength
 /*
  * This file is a modified version of google-diff-match-patch's JavaScript implementation
  * (https://code.google.com/p/google-diff-match-patch/source/browse/trunk/javascript/diff_match_patch_uncompressed.js),
@@ -1997,1067 +2229,1103 @@ if ( typeof define === "function" && define.amd ) {
  *
  * Usage: QUnit.diff(expected, actual)
  *
- * QUnit.diff( "the quick brown fox jumped over", "the quick fox jumps over" ) === "the  quick <del>brown </del> fox jump<ins>s</ins><del>ed</del over"
  */
-QUnit.diff = (function() {
-
-    function DiffMatchPatch() {
-
-        // Defaults.
-        // Redefine these in your program to override the defaults.
-
-        // Number of seconds to map a diff before giving up (0 for infinity).
-        this.DiffTimeout = 1.0;
-        // Cost of an empty edit operation in terms of edit characters.
-        this.DiffEditCost = 4;
-    }
+QUnit.diff = ( function() {
+	function DiffMatchPatch() {
+	}
 
-    //  DIFF FUNCTIONS
+	//  DIFF FUNCTIONS
 
-    /**
-     * The data structure representing a diff is an array of tuples:
-     * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]
-     * which means: delete 'Hello', add 'Goodbye' and keep ' world.'
-     */
-    var DIFF_DELETE = -1,
+	/**
+	 * The data structure representing a diff is an array of tuples:
+	 * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]
+	 * which means: delete 'Hello', add 'Goodbye' and keep ' world.'
+	 */
+	var DIFF_DELETE = -1,
 		DIFF_INSERT = 1,
 		DIFF_EQUAL = 0;
 
-    /**
-     * Find the differences between two texts.  Simplifies the problem by stripping
-     * any common prefix or suffix off the texts before diffing.
-     * @param {string} text1 Old string to be diffed.
-     * @param {string} text2 New string to be diffed.
-     * @param {boolean=} optChecklines Optional speedup flag. If present and false,
-     *     then don't run a line-level diff first to identify the changed areas.
-     *     Defaults to true, which does a faster, slightly less optimal diff.
-     * @param {number} optDeadline Optional time when the diff should be complete
-     *     by.  Used internally for recursive calls.  Users should set DiffTimeout
-     *     instead.
-     * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
-     */
-    DiffMatchPatch.prototype.DiffMain = function( text1, text2, optChecklines, optDeadline ) {
-        var deadline, checklines, commonlength,
+	/**
+	 * Find the differences between two texts.  Simplifies the problem by stripping
+	 * any common prefix or suffix off the texts before diffing.
+	 * @param {string} text1 Old string to be diffed.
+	 * @param {string} text2 New string to be diffed.
+	 * @param {boolean=} optChecklines Optional speedup flag. If present and false,
+	 *     then don't run a line-level diff first to identify the changed areas.
+	 *     Defaults to true, which does a faster, slightly less optimal diff.
+	 * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
+	 */
+	DiffMatchPatch.prototype.DiffMain = function( text1, text2, optChecklines ) {
+		var deadline, checklines, commonlength,
 			commonprefix, commonsuffix, diffs;
-        // Set a deadline by which time the diff must be complete.
-        if ( typeof optDeadline === "undefined" ) {
-            if ( this.DiffTimeout <= 0 ) {
-                optDeadline = Number.MAX_VALUE;
-            } else {
-                optDeadline = ( new Date() ).getTime() + this.DiffTimeout * 1000;
-            }
-        }
-        deadline = optDeadline;
-
-        // Check for null inputs.
-        if ( text1 === null || text2 === null ) {
-            throw new Error( "Null input. (DiffMain)" );
-        }
-
-        // Check for equality (speedup).
-        if ( text1 === text2 ) {
-            if ( text1 ) {
-                return [
-                    [ DIFF_EQUAL, text1 ]
-                ];
-            }
-            return [];
-        }
-
-        if ( typeof optChecklines === "undefined" ) {
-            optChecklines = true;
-        }
-
-        checklines = optChecklines;
-
-        // Trim off common prefix (speedup).
-        commonlength = this.diffCommonPrefix( text1, text2 );
-        commonprefix = text1.substring( 0, commonlength );
-        text1 = text1.substring( commonlength );
-        text2 = text2.substring( commonlength );
-
-        // Trim off common suffix (speedup).
-        /////////
-        commonlength = this.diffCommonSuffix( text1, text2 );
-        commonsuffix = text1.substring( text1.length - commonlength );
-        text1 = text1.substring( 0, text1.length - commonlength );
-        text2 = text2.substring( 0, text2.length - commonlength );
-
-        // Compute the diff on the middle block.
-        diffs = this.diffCompute( text1, text2, checklines, deadline );
-
-        // Restore the prefix and suffix.
-        if ( commonprefix ) {
-            diffs.unshift( [ DIFF_EQUAL, commonprefix ] );
-        }
-        if ( commonsuffix ) {
-            diffs.push( [ DIFF_EQUAL, commonsuffix ] );
-        }
-        this.diffCleanupMerge( diffs );
-        return diffs;
-    };
-
-    /**
-     * Reduce the number of edits by eliminating operationally trivial equalities.
-     * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
-     */
-    DiffMatchPatch.prototype.diffCleanupEfficiency = function( diffs ) {
-        var changes, equalities, equalitiesLength, lastequality,
+
+		// The diff must be complete in up to 1 second.
+		deadline = ( new Date() ).getTime() + 1000;
+
+		// Check for null inputs.
+		if ( text1 === null || text2 === null ) {
+			throw new Error( "Null input. (DiffMain)" );
+		}
+
+		// Check for equality (speedup).
+		if ( text1 === text2 ) {
+			if ( text1 ) {
+				return [
+					[ DIFF_EQUAL, text1 ]
+				];
+			}
+			return [];
+		}
+
+		if ( typeof optChecklines === "undefined" ) {
+			optChecklines = true;
+		}
+
+		checklines = optChecklines;
+
+		// Trim off common prefix (speedup).
+		commonlength = this.diffCommonPrefix( text1, text2 );
+		commonprefix = text1.substring( 0, commonlength );
+		text1 = text1.substring( commonlength );
+		text2 = text2.substring( commonlength );
+
+		// Trim off common suffix (speedup).
+		commonlength = this.diffCommonSuffix( text1, text2 );
+		commonsuffix = text1.substring( text1.length - commonlength );
+		text1 = text1.substring( 0, text1.length - commonlength );
+		text2 = text2.substring( 0, text2.length - commonlength );
+
+		// Compute the diff on the middle block.
+		diffs = this.diffCompute( text1, text2, checklines, deadline );
+
+		// Restore the prefix and suffix.
+		if ( commonprefix ) {
+			diffs.unshift( [ DIFF_EQUAL, commonprefix ] );
+		}
+		if ( commonsuffix ) {
+			diffs.push( [ DIFF_EQUAL, commonsuffix ] );
+		}
+		this.diffCleanupMerge( diffs );
+		return diffs;
+	};
+
+	/**
+	 * Reduce the number of edits by eliminating operationally trivial equalities.
+	 * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
+	 */
+	DiffMatchPatch.prototype.diffCleanupEfficiency = function( diffs ) {
+		var changes, equalities, equalitiesLength, lastequality,
 			pointer, preIns, preDel, postIns, postDel;
-        changes = false;
-        equalities = []; // Stack of indices where equalities are found.
-        equalitiesLength = 0; // Keeping our own length var is faster in JS.
-        /** @type {?string} */
-        lastequality = null;
-        // Always equal to diffs[equalities[equalitiesLength - 1]][1]
-        pointer = 0; // Index of current position.
-        // Is there an insertion operation before the last equality.
-        preIns = false;
-        // Is there a deletion operation before the last equality.
-        preDel = false;
-        // Is there an insertion operation after the last equality.
-        postIns = false;
-        // Is there a deletion operation after the last equality.
-        postDel = false;
-        while ( pointer < diffs.length ) {
-            if ( diffs[ pointer ][ 0 ] === DIFF_EQUAL ) { // Equality found.
-                if ( diffs[ pointer ][ 1 ].length < this.DiffEditCost && ( postIns || postDel ) ) {
-                    // Candidate found.
-                    equalities[ equalitiesLength++ ] = pointer;
-                    preIns = postIns;
-                    preDel = postDel;
-                    lastequality = diffs[ pointer ][ 1 ];
-                } else {
-                    // Not a candidate, and can never become one.
-                    equalitiesLength = 0;
-                    lastequality = null;
-                }
-                postIns = postDel = false;
-            } else { // An insertion or deletion.
-                if ( diffs[ pointer ][ 0 ] === DIFF_DELETE ) {
-                    postDel = true;
-                } else {
-                    postIns = true;
-                }
-                /*
-                 * Five types to be split:
-                 * <ins>A</ins><del>B</del>XY<ins>C</ins><del>D</del>
-                 * <ins>A</ins>X<ins>C</ins><del>D</del>
-                 * <ins>A</ins><del>B</del>X<ins>C</ins>
-                 * <ins>A</del>X<ins>C</ins><del>D</del>
-                 * <ins>A</ins><del>B</del>X<del>C</del>
-                 */
-                if ( lastequality && ( ( preIns && preDel && postIns && postDel ) ||
-                        ( ( lastequality.length < this.DiffEditCost / 2 ) &&
-                            ( preIns + preDel + postIns + postDel ) === 3 ) ) ) {
-                    // Duplicate record.
-                    diffs.splice( equalities[equalitiesLength - 1], 0, [ DIFF_DELETE, lastequality ] );
-                    // Change second copy to insert.
-                    diffs[ equalities[ equalitiesLength - 1 ] + 1 ][ 0 ] = DIFF_INSERT;
-                    equalitiesLength--; // Throw away the equality we just deleted;
-                    lastequality = null;
-                    if (preIns && preDel) {
-                        // No changes made which could affect previous entry, keep going.
-                        postIns = postDel = true;
-                        equalitiesLength = 0;
-                    } else {
-                        equalitiesLength--; // Throw away the previous equality.
-                        pointer = equalitiesLength > 0 ? equalities[ equalitiesLength - 1 ] : -1;
-                        postIns = postDel = false;
-                    }
-                    changes = true;
-                }
-            }
-            pointer++;
-        }
-
-        if ( changes ) {
-            this.diffCleanupMerge( diffs );
-        }
-    };
-
-    /**
-     * Convert a diff array into a pretty HTML report.
-     * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
-     * @param {integer} string to be beautified.
-     * @return {string} HTML representation.
-     */
-    DiffMatchPatch.prototype.diffPrettyHtml = function( diffs ) {
-        var op, data, x, html = [];
-        for ( x = 0; x < diffs.length; x++ ) {
-            op = diffs[x][0]; // Operation (insert, delete, equal)
-            data = diffs[x][1]; // Text of change.
-            switch ( op ) {
-                case DIFF_INSERT:
-                    html[x] = "<ins>" + data + "</ins>";
-                    break;
-                case DIFF_DELETE:
-                    html[x] = "<del>" + data + "</del>";
-                    break;
-                case DIFF_EQUAL:
-                    html[x] = "<span>" + data + "</span>";
-                    break;
-            }
-        }
-        return html.join("");
-    };
-
-    /**
-     * Determine the common prefix of two strings.
-     * @param {string} text1 First string.
-     * @param {string} text2 Second string.
-     * @return {number} The number of characters common to the start of each
-     *     string.
-     */
-    DiffMatchPatch.prototype.diffCommonPrefix = function( text1, text2 ) {
-        var pointermid, pointermax, pointermin, pointerstart;
-        // Quick check for common null cases.
-        if ( !text1 || !text2 || text1.charAt(0) !== text2.charAt(0) ) {
-            return 0;
-        }
-        // Binary search.
-        // Performance analysis: http://neil.fraser.name/news/2007/10/09/
-        pointermin = 0;
-        pointermax = Math.min( text1.length, text2.length );
-        pointermid = pointermax;
-        pointerstart = 0;
-        while ( pointermin < pointermid ) {
-            if ( text1.substring( pointerstart, pointermid ) === text2.substring( pointerstart, pointermid ) ) {
-                pointermin = pointermid;
-                pointerstart = pointermin;
-            } else {
-                pointermax = pointermid;
-            }
-            pointermid = Math.floor( ( pointermax - pointermin ) / 2 + pointermin );
-        }
-        return pointermid;
-    };
-
-    /**
-     * Determine the common suffix of two strings.
-     * @param {string} text1 First string.
-     * @param {string} text2 Second string.
-     * @return {number} The number of characters common to the end of each string.
-     */
-    DiffMatchPatch.prototype.diffCommonSuffix = function( text1, text2 ) {
-        var pointermid, pointermax, pointermin, pointerend;
-        // Quick check for common null cases.
-        if (!text1 || !text2 || text1.charAt(text1.length - 1) !== text2.charAt(text2.length - 1)) {
-            return 0;
-        }
-        // Binary search.
-        // Performance analysis: http://neil.fraser.name/news/2007/10/09/
-        pointermin = 0;
-        pointermax = Math.min(text1.length, text2.length);
-        pointermid = pointermax;
-        pointerend = 0;
-        while ( pointermin < pointermid ) {
-            if (text1.substring( text1.length - pointermid, text1.length - pointerend ) ===
-                text2.substring( text2.length - pointermid, text2.length - pointerend ) ) {
-                pointermin = pointermid;
-                pointerend = pointermin;
-            } else {
-                pointermax = pointermid;
-            }
-            pointermid = Math.floor( ( pointermax - pointermin ) / 2 + pointermin );
-        }
-        return pointermid;
-    };
-
-    /**
-     * Find the differences between two texts.  Assumes that the texts do not
-     * have any common prefix or suffix.
-     * @param {string} text1 Old string to be diffed.
-     * @param {string} text2 New string to be diffed.
-     * @param {boolean} checklines Speedup flag.  If false, then don't run a
-     *     line-level diff first to identify the changed areas.
-     *     If true, then run a faster, slightly less optimal diff.
-     * @param {number} deadline Time when the diff should be complete by.
-     * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffCompute = function( text1, text2, checklines, deadline ) {
-        var diffs, longtext, shorttext, i, hm,
+		changes = false;
+		equalities = []; // Stack of indices where equalities are found.
+		equalitiesLength = 0; // Keeping our own length var is faster in JS.
+		/** @type {?string} */
+		lastequality = null;
+		// Always equal to diffs[equalities[equalitiesLength - 1]][1]
+		pointer = 0; // Index of current position.
+		// Is there an insertion operation before the last equality.
+		preIns = false;
+		// Is there a deletion operation before the last equality.
+		preDel = false;
+		// Is there an insertion operation after the last equality.
+		postIns = false;
+		// Is there a deletion operation after the last equality.
+		postDel = false;
+		while ( pointer < diffs.length ) {
+
+			// Equality found.
+			if ( diffs[ pointer ][ 0 ] === DIFF_EQUAL ) {
+				if ( diffs[ pointer ][ 1 ].length < 4 && ( postIns || postDel ) ) {
+
+					// Candidate found.
+					equalities[ equalitiesLength++ ] = pointer;
+					preIns = postIns;
+					preDel = postDel;
+					lastequality = diffs[ pointer ][ 1 ];
+				} else {
+
+					// Not a candidate, and can never become one.
+					equalitiesLength = 0;
+					lastequality = null;
+				}
+				postIns = postDel = false;
+
+			// An insertion or deletion.
+			} else {
+
+				if ( diffs[ pointer ][ 0 ] === DIFF_DELETE ) {
+					postDel = true;
+				} else {
+					postIns = true;
+				}
+
+				/*
+				 * Five types to be split:
+				 * <ins>A</ins><del>B</del>XY<ins>C</ins><del>D</del>
+				 * <ins>A</ins>X<ins>C</ins><del>D</del>
+				 * <ins>A</ins><del>B</del>X<ins>C</ins>
+				 * <ins>A</del>X<ins>C</ins><del>D</del>
+				 * <ins>A</ins><del>B</del>X<del>C</del>
+				 */
+				if ( lastequality && ( ( preIns && preDel && postIns && postDel ) ||
+						( ( lastequality.length < 2 ) &&
+						( preIns + preDel + postIns + postDel ) === 3 ) ) ) {
+
+					// Duplicate record.
+					diffs.splice(
+						equalities[ equalitiesLength - 1 ],
+						0,
+						[ DIFF_DELETE, lastequality ]
+					);
+
+					// Change second copy to insert.
+					diffs[ equalities[ equalitiesLength - 1 ] + 1 ][ 0 ] = DIFF_INSERT;
+					equalitiesLength--; // Throw away the equality we just deleted;
+					lastequality = null;
+					if ( preIns && preDel ) {
+						// No changes made which could affect previous entry, keep going.
+						postIns = postDel = true;
+						equalitiesLength = 0;
+					} else {
+						equalitiesLength--; // Throw away the previous equality.
+						pointer = equalitiesLength > 0 ? equalities[ equalitiesLength - 1 ] : -1;
+						postIns = postDel = false;
+					}
+					changes = true;
+				}
+			}
+			pointer++;
+		}
+
+		if ( changes ) {
+			this.diffCleanupMerge( diffs );
+		}
+	};
+
+	/**
+	 * Convert a diff array into a pretty HTML report.
+	 * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
+	 * @param {integer} string to be beautified.
+	 * @return {string} HTML representation.
+	 */
+	DiffMatchPatch.prototype.diffPrettyHtml = function( diffs ) {
+		var op, data, x,
+			html = [];
+		for ( x = 0; x < diffs.length; x++ ) {
+			op = diffs[ x ][ 0 ]; // Operation (insert, delete, equal)
+			data = diffs[ x ][ 1 ]; // Text of change.
+			switch ( op ) {
+			case DIFF_INSERT:
+				html[ x ] = "<ins>" + data + "</ins>";
+				break;
+			case DIFF_DELETE:
+				html[ x ] = "<del>" + data + "</del>";
+				break;
+			case DIFF_EQUAL:
+				html[ x ] = "<span>" + data + "</span>";
+				break;
+			}
+		}
+		return html.join( "" );
+	};
+
+	/**
+	 * Determine the common prefix of two strings.
+	 * @param {string} text1 First string.
+	 * @param {string} text2 Second string.
+	 * @return {number} The number of characters common to the start of each
+	 *     string.
+	 */
+	DiffMatchPatch.prototype.diffCommonPrefix = function( text1, text2 ) {
+		var pointermid, pointermax, pointermin, pointerstart;
+		// Quick check for common null cases.
+		if ( !text1 || !text2 || text1.charAt( 0 ) !== text2.charAt( 0 ) ) {
+			return 0;
+		}
+		// Binary search.
+		// Performance analysis: http://neil.fraser.name/news/2007/10/09/
+		pointermin = 0;
+		pointermax = Math.min( text1.length, text2.length );
+		pointermid = pointermax;
+		pointerstart = 0;
+		while ( pointermin < pointermid ) {
+			if ( text1.substring( pointerstart, pointermid ) ===
+					text2.substring( pointerstart, pointermid ) ) {
+				pointermin = pointermid;
+				pointerstart = pointermin;
+			} else {
+				pointermax = pointermid;
+			}
+			pointermid = Math.floor( ( pointermax - pointermin ) / 2 + pointermin );
+		}
+		return pointermid;
+	};
+
+	/**
+	 * Determine the common suffix of two strings.
+	 * @param {string} text1 First string.
+	 * @param {string} text2 Second string.
+	 * @return {number} The number of characters common to the end of each string.
+	 */
+	DiffMatchPatch.prototype.diffCommonSuffix = function( text1, text2 ) {
+		var pointermid, pointermax, pointermin, pointerend;
+		// Quick check for common null cases.
+		if ( !text1 ||
+				!text2 ||
+				text1.charAt( text1.length - 1 ) !== text2.charAt( text2.length - 1 ) ) {
+			return 0;
+		}
+		// Binary search.
+		// Performance analysis: http://neil.fraser.name/news/2007/10/09/
+		pointermin = 0;
+		pointermax = Math.min( text1.length, text2.length );
+		pointermid = pointermax;
+		pointerend = 0;
+		while ( pointermin < pointermid ) {
+			if ( text1.substring( text1.length - pointermid, text1.length - pointerend ) ===
+					text2.substring( text2.length - pointermid, text2.length - pointerend ) ) {
+				pointermin = pointermid;
+				pointerend = pointermin;
+			} else {
+				pointermax = pointermid;
+			}
+			pointermid = Math.floor( ( pointermax - pointermin ) / 2 + pointermin );
+		}
+		return pointermid;
+	};
+
+	/**
+	 * Find the differences between two texts.  Assumes that the texts do not
+	 * have any common prefix or suffix.
+	 * @param {string} text1 Old string to be diffed.
+	 * @param {string} text2 New string to be diffed.
+	 * @param {boolean} checklines Speedup flag.  If false, then don't run a
+	 *     line-level diff first to identify the changed areas.
+	 *     If true, then run a faster, slightly less optimal diff.
+	 * @param {number} deadline Time when the diff should be complete by.
+	 * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffCompute = function( text1, text2, checklines, deadline ) {
+		var diffs, longtext, shorttext, i, hm,
 			text1A, text2A, text1B, text2B,
 			midCommon, diffsA, diffsB;
 
-        if ( !text1 ) {
-            // Just add some text (speedup).
-            return [
-                [ DIFF_INSERT, text2 ]
-            ];
-        }
-
-        if (!text2) {
-            // Just delete some text (speedup).
-            return [
-                [ DIFF_DELETE, text1 ]
-            ];
-        }
-
-        longtext = text1.length > text2.length ? text1 : text2;
-        shorttext = text1.length > text2.length ? text2 : text1;
-        i = longtext.indexOf( shorttext );
-        if ( i !== -1 ) {
-            // Shorter text is inside the longer text (speedup).
-            diffs = [
-                [ DIFF_INSERT, longtext.substring( 0, i ) ],
-                [ DIFF_EQUAL, shorttext ],
-                [ DIFF_INSERT, longtext.substring( i + shorttext.length ) ]
-            ];
-            // Swap insertions for deletions if diff is reversed.
-            if ( text1.length > text2.length ) {
-                diffs[0][0] = diffs[2][0] = DIFF_DELETE;
-            }
-            return diffs;
-        }
-
-        if ( shorttext.length === 1 ) {
-            // Single character string.
-            // After the previous speedup, the character can't be an equality.
-            return [
-                [ DIFF_DELETE, text1 ],
-                [ DIFF_INSERT, text2 ]
-            ];
-        }
-
-        // Check to see if the problem can be split in two.
-        hm = this.diffHalfMatch(text1, text2);
-        if (hm) {
-            // A half-match was found, sort out the return data.
-            text1A = hm[0];
-            text1B = hm[1];
-            text2A = hm[2];
-            text2B = hm[3];
-            midCommon = hm[4];
-            // Send both pairs off for separate processing.
-            diffsA = this.DiffMain(text1A, text2A, checklines, deadline);
-            diffsB = this.DiffMain(text1B, text2B, checklines, deadline);
-            // Merge the results.
-            return diffsA.concat([
-                [ DIFF_EQUAL, midCommon ]
-            ], diffsB);
-        }
-
-        if (checklines && text1.length > 100 && text2.length > 100) {
-            return this.diffLineMode(text1, text2, deadline);
-        }
-
-        return this.diffBisect(text1, text2, deadline);
-    };
-
-    /**
-     * Do the two texts share a substring which is at least half the length of the
-     * longer text?
-     * This speedup can produce non-minimal diffs.
-     * @param {string} text1 First string.
-     * @param {string} text2 Second string.
-     * @return {Array.<string>} Five element Array, containing the prefix of
-     *     text1, the suffix of text1, the prefix of text2, the suffix of
-     *     text2 and the common middle.  Or null if there was no match.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffHalfMatch = function(text1, text2) {
-        var longtext, shorttext, dmp,
+		if ( !text1 ) {
+			// Just add some text (speedup).
+			return [
+				[ DIFF_INSERT, text2 ]
+			];
+		}
+
+		if ( !text2 ) {
+			// Just delete some text (speedup).
+			return [
+				[ DIFF_DELETE, text1 ]
+			];
+		}
+
+		longtext = text1.length > text2.length ? text1 : text2;
+		shorttext = text1.length > text2.length ? text2 : text1;
+		i = longtext.indexOf( shorttext );
+		if ( i !== -1 ) {
+			// Shorter text is inside the longer text (speedup).
+			diffs = [
+				[ DIFF_INSERT, longtext.substring( 0, i ) ],
+				[ DIFF_EQUAL, shorttext ],
+				[ DIFF_INSERT, longtext.substring( i + shorttext.length ) ]
+			];
+			// Swap insertions for deletions if diff is reversed.
+			if ( text1.length > text2.length ) {
+				diffs[ 0 ][ 0 ] = diffs[ 2 ][ 0 ] = DIFF_DELETE;
+			}
+			return diffs;
+		}
+
+		if ( shorttext.length === 1 ) {
+			// Single character string.
+			// After the previous speedup, the character can't be an equality.
+			return [
+				[ DIFF_DELETE, text1 ],
+				[ DIFF_INSERT, text2 ]
+			];
+		}
+
+		// Check to see if the problem can be split in two.
+		hm = this.diffHalfMatch( text1, text2 );
+		if ( hm ) {
+			// A half-match was found, sort out the return data.
+			text1A = hm[ 0 ];
+			text1B = hm[ 1 ];
+			text2A = hm[ 2 ];
+			text2B = hm[ 3 ];
+			midCommon = hm[ 4 ];
+			// Send both pairs off for separate processing.
+			diffsA = this.DiffMain( text1A, text2A, checklines, deadline );
+			diffsB = this.DiffMain( text1B, text2B, checklines, deadline );
+			// Merge the results.
+			return diffsA.concat( [
+				[ DIFF_EQUAL, midCommon ]
+			], diffsB );
+		}
+
+		if ( checklines && text1.length > 100 && text2.length > 100 ) {
+			return this.diffLineMode( text1, text2, deadline );
+		}
+
+		return this.diffBisect( text1, text2, deadline );
+	};
+
+	/**
+	 * Do the two texts share a substring which is at least half the length of the
+	 * longer text?
+	 * This speedup can produce non-minimal diffs.
+	 * @param {string} text1 First string.
+	 * @param {string} text2 Second string.
+	 * @return {Array.<string>} Five element Array, containing the prefix of
+	 *     text1, the suffix of text1, the prefix of text2, the suffix of
+	 *     text2 and the common middle.  Or null if there was no match.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffHalfMatch = function( text1, text2 ) {
+		var longtext, shorttext, dmp,
 			text1A, text2B, text2A, text1B, midCommon,
 			hm1, hm2, hm;
-        if (this.DiffTimeout <= 0) {
-            // Don't risk returning a non-optimal diff if we have unlimited time.
-            return null;
-        }
-        longtext = text1.length > text2.length ? text1 : text2;
-        shorttext = text1.length > text2.length ? text2 : text1;
-        if (longtext.length < 4 || shorttext.length * 2 < longtext.length) {
-            return null; // Pointless.
-        }
-        dmp = this; // 'this' becomes 'window' in a closure.
-
-        /**
-         * Does a substring of shorttext exist within longtext such that the substring
-         * is at least half the length of longtext?
-         * Closure, but does not reference any external variables.
-         * @param {string} longtext Longer string.
-         * @param {string} shorttext Shorter string.
-         * @param {number} i Start index of quarter length substring within longtext.
-         * @return {Array.<string>} Five element Array, containing the prefix of
-         *     longtext, the suffix of longtext, the prefix of shorttext, the suffix
-         *     of shorttext and the common middle.  Or null if there was no match.
-         * @private
-         */
-        function diffHalfMatchI(longtext, shorttext, i) {
-            var seed, j, bestCommon, prefixLength, suffixLength,
+
+		longtext = text1.length > text2.length ? text1 : text2;
+		shorttext = text1.length > text2.length ? text2 : text1;
+		if ( longtext.length < 4 || shorttext.length * 2 < longtext.length ) {
+			return null; // Pointless.
+		}
+		dmp = this; // 'this' becomes 'window' in a closure.
+
+		/**
+		 * Does a substring of shorttext exist within longtext such that the substring
+		 * is at least half the length of longtext?
+		 * Closure, but does not reference any external variables.
+		 * @param {string} longtext Longer string.
+		 * @param {string} shorttext Shorter string.
+		 * @param {number} i Start index of quarter length substring within longtext.
+		 * @return {Array.<string>} Five element Array, containing the prefix of
+		 *     longtext, the suffix of longtext, the prefix of shorttext, the suffix
+		 *     of shorttext and the common middle.  Or null if there was no match.
+		 * @private
+		 */
+		function diffHalfMatchI( longtext, shorttext, i ) {
+			var seed, j, bestCommon, prefixLength, suffixLength,
 				bestLongtextA, bestLongtextB, bestShorttextA, bestShorttextB;
-            // Start with a 1/4 length substring at position i as a seed.
-            seed = longtext.substring(i, i + Math.floor(longtext.length / 4));
-            j = -1;
-            bestCommon = "";
-            while ((j = shorttext.indexOf(seed, j + 1)) !== -1) {
-                prefixLength = dmp.diffCommonPrefix(longtext.substring(i),
-                    shorttext.substring(j));
-                suffixLength = dmp.diffCommonSuffix(longtext.substring(0, i),
-                    shorttext.substring(0, j));
-                if (bestCommon.length < suffixLength + prefixLength) {
-                    bestCommon = shorttext.substring(j - suffixLength, j) +
-                        shorttext.substring(j, j + prefixLength);
-                    bestLongtextA = longtext.substring(0, i - suffixLength);
-                    bestLongtextB = longtext.substring(i + prefixLength);
-                    bestShorttextA = shorttext.substring(0, j - suffixLength);
-                    bestShorttextB = shorttext.substring(j + prefixLength);
-                }
-            }
-            if (bestCommon.length * 2 >= longtext.length) {
-                return [ bestLongtextA, bestLongtextB,
-                    bestShorttextA, bestShorttextB, bestCommon
-                ];
-            } else {
-                return null;
-            }
-        }
-
-        // First check if the second quarter is the seed for a half-match.
-        hm1 = diffHalfMatchI(longtext, shorttext,
-            Math.ceil(longtext.length / 4));
-        // Check again based on the third quarter.
-        hm2 = diffHalfMatchI(longtext, shorttext,
-            Math.ceil(longtext.length / 2));
-        if (!hm1 && !hm2) {
-            return null;
-        } else if (!hm2) {
-            hm = hm1;
-        } else if (!hm1) {
-            hm = hm2;
-        } else {
-            // Both matched.  Select the longest.
-            hm = hm1[4].length > hm2[4].length ? hm1 : hm2;
-        }
-
-        // A half-match was found, sort out the return data.
-        text1A, text1B, text2A, text2B;
-        if (text1.length > text2.length) {
-            text1A = hm[0];
-            text1B = hm[1];
-            text2A = hm[2];
-            text2B = hm[3];
-        } else {
-            text2A = hm[0];
-            text2B = hm[1];
-            text1A = hm[2];
-            text1B = hm[3];
-        }
-        midCommon = hm[4];
-        return [ text1A, text1B, text2A, text2B, midCommon ];
-    };
-
-    /**
-     * Do a quick line-level diff on both strings, then rediff the parts for
-     * greater accuracy.
-     * This speedup can produce non-minimal diffs.
-     * @param {string} text1 Old string to be diffed.
-     * @param {string} text2 New string to be diffed.
-     * @param {number} deadline Time when the diff should be complete by.
-     * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffLineMode = function(text1, text2, deadline) {
-        var a, diffs, linearray, pointer, countInsert,
+			// Start with a 1/4 length substring at position i as a seed.
+			seed = longtext.substring( i, i + Math.floor( longtext.length / 4 ) );
+			j = -1;
+			bestCommon = "";
+			while ( ( j = shorttext.indexOf( seed, j + 1 ) ) !== -1 ) {
+				prefixLength = dmp.diffCommonPrefix( longtext.substring( i ),
+					shorttext.substring( j ) );
+				suffixLength = dmp.diffCommonSuffix( longtext.substring( 0, i ),
+					shorttext.substring( 0, j ) );
+				if ( bestCommon.length < suffixLength + prefixLength ) {
+					bestCommon = shorttext.substring( j - suffixLength, j ) +
+						shorttext.substring( j, j + prefixLength );
+					bestLongtextA = longtext.substring( 0, i - suffixLength );
+					bestLongtextB = longtext.substring( i + prefixLength );
+					bestShorttextA = shorttext.substring( 0, j - suffixLength );
+					bestShorttextB = shorttext.substring( j + prefixLength );
+				}
+			}
+			if ( bestCommon.length * 2 >= longtext.length ) {
+				return [ bestLongtextA, bestLongtextB,
+					bestShorttextA, bestShorttextB, bestCommon
+				];
+			} else {
+				return null;
+			}
+		}
+
+		// First check if the second quarter is the seed for a half-match.
+		hm1 = diffHalfMatchI( longtext, shorttext,
+			Math.ceil( longtext.length / 4 ) );
+		// Check again based on the third quarter.
+		hm2 = diffHalfMatchI( longtext, shorttext,
+			Math.ceil( longtext.length / 2 ) );
+		if ( !hm1 && !hm2 ) {
+			return null;
+		} else if ( !hm2 ) {
+			hm = hm1;
+		} else if ( !hm1 ) {
+			hm = hm2;
+		} else {
+			// Both matched.  Select the longest.
+			hm = hm1[ 4 ].length > hm2[ 4 ].length ? hm1 : hm2;
+		}
+
+		// A half-match was found, sort out the return data.
+		text1A, text1B, text2A, text2B;
+		if ( text1.length > text2.length ) {
+			text1A = hm[ 0 ];
+			text1B = hm[ 1 ];
+			text2A = hm[ 2 ];
+			text2B = hm[ 3 ];
+		} else {
+			text2A = hm[ 0 ];
+			text2B = hm[ 1 ];
+			text1A = hm[ 2 ];
+			text1B = hm[ 3 ];
+		}
+		midCommon = hm[ 4 ];
+		return [ text1A, text1B, text2A, text2B, midCommon ];
+	};
+
+	/**
+	 * Do a quick line-level diff on both strings, then rediff the parts for
+	 * greater accuracy.
+	 * This speedup can produce non-minimal diffs.
+	 * @param {string} text1 Old string to be diffed.
+	 * @param {string} text2 New string to be diffed.
+	 * @param {number} deadline Time when the diff should be complete by.
+	 * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffLineMode = function( text1, text2, deadline ) {
+		var a, diffs, linearray, pointer, countInsert,
 			countDelete, textInsert, textDelete, j;
-        // Scan the text on a line-by-line basis first.
-        a = this.diffLinesToChars(text1, text2);
-        text1 = a.chars1;
-        text2 = a.chars2;
-        linearray = a.lineArray;
-
-        diffs = this.DiffMain(text1, text2, false, deadline);
-
-        // Convert the diff back to original text.
-        this.diffCharsToLines(diffs, linearray);
-        // Eliminate freak matches (e.g. blank lines)
-        this.diffCleanupSemantic(diffs);
-
-        // Rediff any replacement blocks, this time character-by-character.
-        // Add a dummy entry at the end.
-        diffs.push( [ DIFF_EQUAL, "" ] );
-        pointer = 0;
-        countDelete = 0;
-        countInsert = 0;
-        textDelete = "";
-        textInsert = "";
-        while (pointer < diffs.length) {
-            switch ( diffs[pointer][0] ) {
-                case DIFF_INSERT:
-                    countInsert++;
-                    textInsert += diffs[pointer][1];
-                    break;
-                case DIFF_DELETE:
-                    countDelete++;
-                    textDelete += diffs[pointer][1];
-                    break;
-                case DIFF_EQUAL:
-                    // Upon reaching an equality, check for prior redundancies.
-                    if (countDelete >= 1 && countInsert >= 1) {
-                        // Delete the offending records and add the merged ones.
-                        diffs.splice(pointer - countDelete - countInsert,
-                            countDelete + countInsert);
-                        pointer = pointer - countDelete - countInsert;
-                        a = this.DiffMain(textDelete, textInsert, false, deadline);
-                        for (j = a.length - 1; j >= 0; j--) {
-                            diffs.splice( pointer, 0, a[j] );
-                        }
-                        pointer = pointer + a.length;
-                    }
-                    countInsert = 0;
-                    countDelete = 0;
-                    textDelete = "";
-                    textInsert = "";
-                    break;
-            }
-            pointer++;
-        }
-        diffs.pop(); // Remove the dummy entry at the end.
-
-        return diffs;
-    };
-
-    /**
-     * Find the 'middle snake' of a diff, split the problem in two
-     * and return the recursively constructed diff.
-     * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.
-     * @param {string} text1 Old string to be diffed.
-     * @param {string} text2 New string to be diffed.
-     * @param {number} deadline Time at which to bail if not yet complete.
-     * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffBisect = function(text1, text2, deadline) {
-        var text1Length, text2Length, maxD, vOffset, vLength,
+		// Scan the text on a line-by-line basis first.
+		a = this.diffLinesToChars( text1, text2 );
+		text1 = a.chars1;
+		text2 = a.chars2;
+		linearray = a.lineArray;
+
+		diffs = this.DiffMain( text1, text2, false, deadline );
+
+		// Convert the diff back to original text.
+		this.diffCharsToLines( diffs, linearray );
+		// Eliminate freak matches (e.g. blank lines)
+		this.diffCleanupSemantic( diffs );
+
+		// Rediff any replacement blocks, this time character-by-character.
+		// Add a dummy entry at the end.
+		diffs.push( [ DIFF_EQUAL, "" ] );
+		pointer = 0;
+		countDelete = 0;
+		countInsert = 0;
+		textDelete = "";
+		textInsert = "";
+		while ( pointer < diffs.length ) {
+			switch ( diffs[ pointer ][ 0 ] ) {
+			case DIFF_INSERT:
+				countInsert++;
+				textInsert += diffs[ pointer ][ 1 ];
+				break;
+			case DIFF_DELETE:
+				countDelete++;
+				textDelete += diffs[ pointer ][ 1 ];
+				break;
+			case DIFF_EQUAL:
+				// Upon reaching an equality, check for prior redundancies.
+				if ( countDelete >= 1 && countInsert >= 1 ) {
+					// Delete the offending records and add the merged ones.
+					diffs.splice( pointer - countDelete - countInsert,
+						countDelete + countInsert );
+					pointer = pointer - countDelete - countInsert;
+					a = this.DiffMain( textDelete, textInsert, false, deadline );
+					for ( j = a.length - 1; j >= 0; j-- ) {
+						diffs.splice( pointer, 0, a[ j ] );
+					}
+					pointer = pointer + a.length;
+				}
+				countInsert = 0;
+				countDelete = 0;
+				textDelete = "";
+				textInsert = "";
+				break;
+			}
+			pointer++;
+		}
+		diffs.pop(); // Remove the dummy entry at the end.
+
+		return diffs;
+	};
+
+	/**
+	 * Find the 'middle snake' of a diff, split the problem in two
+	 * and return the recursively constructed diff.
+	 * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.
+	 * @param {string} text1 Old string to be diffed.
+	 * @param {string} text2 New string to be diffed.
+	 * @param {number} deadline Time at which to bail if not yet complete.
+	 * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffBisect = function( text1, text2, deadline ) {
+		var text1Length, text2Length, maxD, vOffset, vLength,
 			v1, v2, x, delta, front, k1start, k1end, k2start,
 			k2end, k2Offset, k1Offset, x1, x2, y1, y2, d, k1, k2;
-        // Cache the text lengths to prevent multiple calls.
-        text1Length = text1.length;
-        text2Length = text2.length;
-        maxD = Math.ceil((text1Length + text2Length) / 2);
-        vOffset = maxD;
-        vLength = 2 * maxD;
-        v1 = new Array(vLength);
-        v2 = new Array(vLength);
-        // Setting all elements to -1 is faster in Chrome & Firefox than mixing
-        // integers and undefined.
-        for (x = 0; x < vLength; x++) {
-            v1[x] = -1;
-            v2[x] = -1;
-        }
-        v1[vOffset + 1] = 0;
-        v2[vOffset + 1] = 0;
-        delta = text1Length - text2Length;
-        // If the total number of characters is odd, then the front path will collide
-        // with the reverse path.
-        front = (delta % 2 !== 0);
-        // Offsets for start and end of k loop.
-        // Prevents mapping of space beyond the grid.
-        k1start = 0;
-        k1end = 0;
-        k2start = 0;
-        k2end = 0;
-        for (d = 0; d < maxD; d++) {
-            // Bail out if deadline is reached.
-            if ((new Date()).getTime() > deadline) {
-                break;
-            }
-
-            // Walk the front path one step.
-            for (k1 = -d + k1start; k1 <= d - k1end; k1 += 2) {
-                k1Offset = vOffset + k1;
-                if ( k1 === -d || ( k1 !== d && v1[ k1Offset - 1 ] < v1[ k1Offset + 1 ] ) ) {
-                    x1 = v1[k1Offset + 1];
-                } else {
-                    x1 = v1[k1Offset - 1] + 1;
-                }
-                y1 = x1 - k1;
-                while (x1 < text1Length && y1 < text2Length &&
-                    text1.charAt(x1) === text2.charAt(y1)) {
-                    x1++;
-                    y1++;
-                }
-                v1[k1Offset] = x1;
-                if (x1 > text1Length) {
-                    // Ran off the right of the graph.
-                    k1end += 2;
-                } else if (y1 > text2Length) {
-                    // Ran off the bottom of the graph.
-                    k1start += 2;
-                } else if (front) {
-                    k2Offset = vOffset + delta - k1;
-                    if (k2Offset >= 0 && k2Offset < vLength && v2[k2Offset] !== -1) {
-                        // Mirror x2 onto top-left coordinate system.
-                        x2 = text1Length - v2[k2Offset];
-                        if (x1 >= x2) {
-                            // Overlap detected.
-                            return this.diffBisectSplit(text1, text2, x1, y1, deadline);
-                        }
-                    }
-                }
-            }
-
-            // Walk the reverse path one step.
-            for (k2 = -d + k2start; k2 <= d - k2end; k2 += 2) {
-                k2Offset = vOffset + k2;
-                if ( k2 === -d || (k2 !== d && v2[ k2Offset - 1 ] < v2[ k2Offset + 1 ] ) ) {
-                    x2 = v2[k2Offset + 1];
-                } else {
-                    x2 = v2[k2Offset - 1] + 1;
-                }
-                y2 = x2 - k2;
-                while (x2 < text1Length && y2 < text2Length &&
-                    text1.charAt(text1Length - x2 - 1) ===
-                    text2.charAt(text2Length - y2 - 1)) {
-                    x2++;
-                    y2++;
-                }
-                v2[k2Offset] = x2;
-                if (x2 > text1Length) {
-                    // Ran off the left of the graph.
-                    k2end += 2;
-                } else if (y2 > text2Length) {
-                    // Ran off the top of the graph.
-                    k2start += 2;
-                } else if (!front) {
-                    k1Offset = vOffset + delta - k2;
-                    if (k1Offset >= 0 && k1Offset < vLength && v1[k1Offset] !== -1) {
-                        x1 = v1[k1Offset];
-                        y1 = vOffset + x1 - k1Offset;
-                        // Mirror x2 onto top-left coordinate system.
-                        x2 = text1Length - x2;
-                        if (x1 >= x2) {
-                            // Overlap detected.
-                            return this.diffBisectSplit(text1, text2, x1, y1, deadline);
-                        }
-                    }
-                }
-            }
-        }
-        // Diff took too long and hit the deadline or
-        // number of diffs equals number of characters, no commonality at all.
-        return [
-            [ DIFF_DELETE, text1 ],
-            [ DIFF_INSERT, text2 ]
-        ];
-    };
-
-    /**
-     * Given the location of the 'middle snake', split the diff in two parts
-     * and recurse.
-     * @param {string} text1 Old string to be diffed.
-     * @param {string} text2 New string to be diffed.
-     * @param {number} x Index of split point in text1.
-     * @param {number} y Index of split point in text2.
-     * @param {number} deadline Time at which to bail if not yet complete.
-     * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffBisectSplit = function( text1, text2, x, y, deadline ) {
-        var text1a, text1b, text2a, text2b, diffs, diffsb;
-        text1a = text1.substring(0, x);
-        text2a = text2.substring(0, y);
-        text1b = text1.substring(x);
-        text2b = text2.substring(y);
-
-        // Compute both diffs serially.
-        diffs = this.DiffMain(text1a, text2a, false, deadline);
-        diffsb = this.DiffMain(text1b, text2b, false, deadline);
-
-        return diffs.concat(diffsb);
-    };
-
-    /**
-     * Reduce the number of edits by eliminating semantically trivial equalities.
-     * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
-     */
-    DiffMatchPatch.prototype.diffCleanupSemantic = function(diffs) {
-        var changes, equalities, equalitiesLength, lastequality,
+		// Cache the text lengths to prevent multiple calls.
+		text1Length = text1.length;
+		text2Length = text2.length;
+		maxD = Math.ceil( ( text1Length + text2Length ) / 2 );
+		vOffset = maxD;
+		vLength = 2 * maxD;
+		v1 = new Array( vLength );
+		v2 = new Array( vLength );
+		// Setting all elements to -1 is faster in Chrome & Firefox than mixing
+		// integers and undefined.
+		for ( x = 0; x < vLength; x++ ) {
+			v1[ x ] = -1;
+			v2[ x ] = -1;
+		}
+		v1[ vOffset + 1 ] = 0;
+		v2[ vOffset + 1 ] = 0;
+		delta = text1Length - text2Length;
+		// If the total number of characters is odd, then the front path will collide
+		// with the reverse path.
+		front = ( delta % 2 !== 0 );
+		// Offsets for start and end of k loop.
+		// Prevents mapping of space beyond the grid.
+		k1start = 0;
+		k1end = 0;
+		k2start = 0;
+		k2end = 0;
+		for ( d = 0; d < maxD; d++ ) {
+			// Bail out if deadline is reached.
+			if ( ( new Date() ).getTime() > deadline ) {
+				break;
+			}
+
+			// Walk the front path one step.
+			for ( k1 = -d + k1start; k1 <= d - k1end; k1 += 2 ) {
+				k1Offset = vOffset + k1;
+				if ( k1 === -d || ( k1 !== d && v1[ k1Offset - 1 ] < v1[ k1Offset + 1 ] ) ) {
+					x1 = v1[ k1Offset + 1 ];
+				} else {
+					x1 = v1[ k1Offset - 1 ] + 1;
+				}
+				y1 = x1 - k1;
+				while ( x1 < text1Length && y1 < text2Length &&
+					text1.charAt( x1 ) === text2.charAt( y1 ) ) {
+					x1++;
+					y1++;
+				}
+				v1[ k1Offset ] = x1;
+				if ( x1 > text1Length ) {
+					// Ran off the right of the graph.
+					k1end += 2;
+				} else if ( y1 > text2Length ) {
+					// Ran off the bottom of the graph.
+					k1start += 2;
+				} else if ( front ) {
+					k2Offset = vOffset + delta - k1;
+					if ( k2Offset >= 0 && k2Offset < vLength && v2[ k2Offset ] !== -1 ) {
+						// Mirror x2 onto top-left coordinate system.
+						x2 = text1Length - v2[ k2Offset ];
+						if ( x1 >= x2 ) {
+							// Overlap detected.
+							return this.diffBisectSplit( text1, text2, x1, y1, deadline );
+						}
+					}
+				}
+			}
+
+			// Walk the reverse path one step.
+			for ( k2 = -d + k2start; k2 <= d - k2end; k2 += 2 ) {
+				k2Offset = vOffset + k2;
+				if ( k2 === -d || ( k2 !== d && v2[ k2Offset - 1 ] < v2[ k2Offset + 1 ] ) ) {
+					x2 = v2[ k2Offset + 1 ];
+				} else {
+					x2 = v2[ k2Offset - 1 ] + 1;
+				}
+				y2 = x2 - k2;
+				while ( x2 < text1Length && y2 < text2Length &&
+					text1.charAt( text1Length - x2 - 1 ) ===
+					text2.charAt( text2Length - y2 - 1 ) ) {
+					x2++;
+					y2++;
+				}
+				v2[ k2Offset ] = x2;
+				if ( x2 > text1Length ) {
+					// Ran off the left of the graph.
+					k2end += 2;
+				} else if ( y2 > text2Length ) {
+					// Ran off the top of the graph.
+					k2start += 2;
+				} else if ( !front ) {
+					k1Offset = vOffset + delta - k2;
+					if ( k1Offset >= 0 && k1Offset < vLength && v1[ k1Offset ] !== -1 ) {
+						x1 = v1[ k1Offset ];
+						y1 = vOffset + x1 - k1Offset;
+						// Mirror x2 onto top-left coordinate system.
+						x2 = text1Length - x2;
+						if ( x1 >= x2 ) {
+							// Overlap detected.
+							return this.diffBisectSplit( text1, text2, x1, y1, deadline );
+						}
+					}
+				}
+			}
+		}
+		// Diff took too long and hit the deadline or
+		// number of diffs equals number of characters, no commonality at all.
+		return [
+			[ DIFF_DELETE, text1 ],
+			[ DIFF_INSERT, text2 ]
+		];
+	};
+
+	/**
+	 * Given the location of the 'middle snake', split the diff in two parts
+	 * and recurse.
+	 * @param {string} text1 Old string to be diffed.
+	 * @param {string} text2 New string to be diffed.
+	 * @param {number} x Index of split point in text1.
+	 * @param {number} y Index of split point in text2.
+	 * @param {number} deadline Time at which to bail if not yet complete.
+	 * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffBisectSplit = function( text1, text2, x, y, deadline ) {
+		var text1a, text1b, text2a, text2b, diffs, diffsb;
+		text1a = text1.substring( 0, x );
+		text2a = text2.substring( 0, y );
+		text1b = text1.substring( x );
+		text2b = text2.substring( y );
+
+		// Compute both diffs serially.
+		diffs = this.DiffMain( text1a, text2a, false, deadline );
+		diffsb = this.DiffMain( text1b, text2b, false, deadline );
+
+		return diffs.concat( diffsb );
+	};
+
+	/**
+	 * Reduce the number of edits by eliminating semantically trivial equalities.
+	 * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
+	 */
+	DiffMatchPatch.prototype.diffCleanupSemantic = function( diffs ) {
+		var changes, equalities, equalitiesLength, lastequality,
 			pointer, lengthInsertions2, lengthDeletions2, lengthInsertions1,
 			lengthDeletions1, deletion, insertion, overlapLength1, overlapLength2;
-        changes = false;
-        equalities = []; // Stack of indices where equalities are found.
-        equalitiesLength = 0; // Keeping our own length var is faster in JS.
-        /** @type {?string} */
-        lastequality = null;
-        // Always equal to diffs[equalities[equalitiesLength - 1]][1]
-        pointer = 0; // Index of current position.
-        // Number of characters that changed prior to the equality.
-        lengthInsertions1 = 0;
-        lengthDeletions1 = 0;
-        // Number of characters that changed after the equality.
-        lengthInsertions2 = 0;
-        lengthDeletions2 = 0;
-        while (pointer < diffs.length) {
-            if (diffs[pointer][0] === DIFF_EQUAL) { // Equality found.
-                equalities[equalitiesLength++] = pointer;
-                lengthInsertions1 = lengthInsertions2;
-                lengthDeletions1 = lengthDeletions2;
-                lengthInsertions2 = 0;
-                lengthDeletions2 = 0;
-                lastequality = diffs[pointer][1];
-            } else { // An insertion or deletion.
-                if (diffs[pointer][0] === DIFF_INSERT) {
-                    lengthInsertions2 += diffs[pointer][1].length;
-                } else {
-                    lengthDeletions2 += diffs[pointer][1].length;
-                }
-                // Eliminate an equality that is smaller or equal to the edits on both
-                // sides of it.
-                if (lastequality && (lastequality.length <=
-                        Math.max(lengthInsertions1, lengthDeletions1)) &&
-                    (lastequality.length <= Math.max(lengthInsertions2,
-                        lengthDeletions2))) {
-                    // Duplicate record.
-                    diffs.splice( equalities[ equalitiesLength - 1 ], 0, [ DIFF_DELETE, lastequality ] );
-                    // Change second copy to insert.
-                    diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;
-                    // Throw away the equality we just deleted.
-                    equalitiesLength--;
-                    // Throw away the previous equality (it needs to be reevaluated).
-                    equalitiesLength--;
-                    pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;
-                    lengthInsertions1 = 0; // Reset the counters.
-                    lengthDeletions1 = 0;
-                    lengthInsertions2 = 0;
-                    lengthDeletions2 = 0;
-                    lastequality = null;
-                    changes = true;
-                }
-            }
-            pointer++;
-        }
-
-        // Normalize the diff.
-        if (changes) {
-            this.diffCleanupMerge(diffs);
-        }
-
-        // Find any overlaps between deletions and insertions.
-        // e.g: <del>abcxxx</del><ins>xxxdef</ins>
-        //   -> <del>abc</del>xxx<ins>def</ins>
-        // e.g: <del>xxxabc</del><ins>defxxx</ins>
-        //   -> <ins>def</ins>xxx<del>abc</del>
-        // Only extract an overlap if it is as big as the edit ahead or behind it.
-        pointer = 1;
-        while (pointer < diffs.length) {
-            if (diffs[pointer - 1][0] === DIFF_DELETE &&
-                diffs[pointer][0] === DIFF_INSERT) {
-                deletion = diffs[pointer - 1][1];
-                insertion = diffs[pointer][1];
-                overlapLength1 = this.diffCommonOverlap(deletion, insertion);
-                overlapLength2 = this.diffCommonOverlap(insertion, deletion);
-                if (overlapLength1 >= overlapLength2) {
-                    if (overlapLength1 >= deletion.length / 2 ||
-                        overlapLength1 >= insertion.length / 2) {
-                        // Overlap found.  Insert an equality and trim the surrounding edits.
-                        diffs.splice( pointer, 0, [ DIFF_EQUAL, insertion.substring( 0, overlapLength1 ) ] );
-                        diffs[pointer - 1][1] =
-                            deletion.substring(0, deletion.length - overlapLength1);
-                        diffs[pointer + 1][1] = insertion.substring(overlapLength1);
-                        pointer++;
-                    }
-                } else {
-                    if (overlapLength2 >= deletion.length / 2 ||
-                        overlapLength2 >= insertion.length / 2) {
-                        // Reverse overlap found.
-                        // Insert an equality and swap and trim the surrounding edits.
-                        diffs.splice( pointer, 0, [ DIFF_EQUAL, deletion.substring( 0, overlapLength2 ) ] );
-                        diffs[pointer - 1][0] = DIFF_INSERT;
-                        diffs[pointer - 1][1] =
-                            insertion.substring(0, insertion.length - overlapLength2);
-                        diffs[pointer + 1][0] = DIFF_DELETE;
-                        diffs[pointer + 1][1] =
-                            deletion.substring(overlapLength2);
-                        pointer++;
-                    }
-                }
-                pointer++;
-            }
-            pointer++;
-        }
-    };
-
-    /**
-     * Determine if the suffix of one string is the prefix of another.
-     * @param {string} text1 First string.
-     * @param {string} text2 Second string.
-     * @return {number} The number of characters common to the end of the first
-     *     string and the start of the second string.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffCommonOverlap = function(text1, text2) {
-        var text1Length, text2Length, textLength,
+		changes = false;
+		equalities = []; // Stack of indices where equalities are found.
+		equalitiesLength = 0; // Keeping our own length var is faster in JS.
+		/** @type {?string} */
+		lastequality = null;
+		// Always equal to diffs[equalities[equalitiesLength - 1]][1]
+		pointer = 0; // Index of current position.
+		// Number of characters that changed prior to the equality.
+		lengthInsertions1 = 0;
+		lengthDeletions1 = 0;
+		// Number of characters that changed after the equality.
+		lengthInsertions2 = 0;
+		lengthDeletions2 = 0;
+		while ( pointer < diffs.length ) {
+			if ( diffs[ pointer ][ 0 ] === DIFF_EQUAL ) { // Equality found.
+				equalities[ equalitiesLength++ ] = pointer;
+				lengthInsertions1 = lengthInsertions2;
+				lengthDeletions1 = lengthDeletions2;
+				lengthInsertions2 = 0;
+				lengthDeletions2 = 0;
+				lastequality = diffs[ pointer ][ 1 ];
+			} else { // An insertion or deletion.
+				if ( diffs[ pointer ][ 0 ] === DIFF_INSERT ) {
+					lengthInsertions2 += diffs[ pointer ][ 1 ].length;
+				} else {
+					lengthDeletions2 += diffs[ pointer ][ 1 ].length;
+				}
+				// Eliminate an equality that is smaller or equal to the edits on both
+				// sides of it.
+				if ( lastequality && ( lastequality.length <=
+						Math.max( lengthInsertions1, lengthDeletions1 ) ) &&
+						( lastequality.length <= Math.max( lengthInsertions2,
+							lengthDeletions2 ) ) ) {
+
+					// Duplicate record.
+					diffs.splice(
+						equalities[ equalitiesLength - 1 ],
+						0,
+						[ DIFF_DELETE, lastequality ]
+					);
+
+					// Change second copy to insert.
+					diffs[ equalities[ equalitiesLength - 1 ] + 1 ][ 0 ] = DIFF_INSERT;
+
+					// Throw away the equality we just deleted.
+					equalitiesLength--;
+
+					// Throw away the previous equality (it needs to be reevaluated).
+					equalitiesLength--;
+					pointer = equalitiesLength > 0 ? equalities[ equalitiesLength - 1 ] : -1;
+
+					// Reset the counters.
+					lengthInsertions1 = 0;
+					lengthDeletions1 = 0;
+					lengthInsertions2 = 0;
+					lengthDeletions2 = 0;
+					lastequality = null;
+					changes = true;
+				}
+			}
+			pointer++;
+		}
+
+		// Normalize the diff.
+		if ( changes ) {
+			this.diffCleanupMerge( diffs );
+		}
+
+		// Find any overlaps between deletions and insertions.
+		// e.g: <del>abcxxx</del><ins>xxxdef</ins>
+		//   -> <del>abc</del>xxx<ins>def</ins>
+		// e.g: <del>xxxabc</del><ins>defxxx</ins>
+		//   -> <ins>def</ins>xxx<del>abc</del>
+		// Only extract an overlap if it is as big as the edit ahead or behind it.
+		pointer = 1;
+		while ( pointer < diffs.length ) {
+			if ( diffs[ pointer - 1 ][ 0 ] === DIFF_DELETE &&
+					diffs[ pointer ][ 0 ] === DIFF_INSERT ) {
+				deletion = diffs[ pointer - 1 ][ 1 ];
+				insertion = diffs[ pointer ][ 1 ];
+				overlapLength1 = this.diffCommonOverlap( deletion, insertion );
+				overlapLength2 = this.diffCommonOverlap( insertion, deletion );
+				if ( overlapLength1 >= overlapLength2 ) {
+					if ( overlapLength1 >= deletion.length / 2 ||
+							overlapLength1 >= insertion.length / 2 ) {
+						// Overlap found.  Insert an equality and trim the surrounding edits.
+						diffs.splice(
+							pointer,
+							0,
+							[ DIFF_EQUAL, insertion.substring( 0, overlapLength1 ) ]
+						);
+						diffs[ pointer - 1 ][ 1 ] =
+							deletion.substring( 0, deletion.length - overlapLength1 );
+						diffs[ pointer + 1 ][ 1 ] = insertion.substring( overlapLength1 );
+						pointer++;
+					}
+				} else {
+					if ( overlapLength2 >= deletion.length / 2 ||
+							overlapLength2 >= insertion.length / 2 ) {
+
+						// Reverse overlap found.
+						// Insert an equality and swap and trim the surrounding edits.
+						diffs.splice(
+							pointer,
+							0,
+							[ DIFF_EQUAL, deletion.substring( 0, overlapLength2 ) ]
+						);
+
+						diffs[ pointer - 1 ][ 0 ] = DIFF_INSERT;
+						diffs[ pointer - 1 ][ 1 ] =
+							insertion.substring( 0, insertion.length - overlapLength2 );
+						diffs[ pointer + 1 ][ 0 ] = DIFF_DELETE;
+						diffs[ pointer + 1 ][ 1 ] =
+							deletion.substring( overlapLength2 );
+						pointer++;
+					}
+				}
+				pointer++;
+			}
+			pointer++;
+		}
+	};
+
+	/**
+	 * Determine if the suffix of one string is the prefix of another.
+	 * @param {string} text1 First string.
+	 * @param {string} text2 Second string.
+	 * @return {number} The number of characters common to the end of the first
+	 *     string and the start of the second string.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffCommonOverlap = function( text1, text2 ) {
+		var text1Length, text2Length, textLength,
 			best, length, pattern, found;
-        // Cache the text lengths to prevent multiple calls.
-        text1Length = text1.length;
-        text2Length = text2.length;
-        // Eliminate the null case.
-        if (text1Length === 0 || text2Length === 0) {
-            return 0;
-        }
-        // Truncate the longer string.
-        if (text1Length > text2Length) {
-            text1 = text1.substring(text1Length - text2Length);
-        } else if (text1Length < text2Length) {
-            text2 = text2.substring(0, text1Length);
-        }
-        textLength = Math.min(text1Length, text2Length);
-        // Quick check for the worst case.
-        if (text1 === text2) {
-            return textLength;
-        }
-
-        // Start by looking for a single character match
-        // and increase length until no match is found.
-        // Performance analysis: http://neil.fraser.name/news/2010/11/04/
-        best = 0;
-        length = 1;
-        while (true) {
-            pattern = text1.substring(textLength - length);
-            found = text2.indexOf(pattern);
-            if (found === -1) {
-                return best;
-            }
-            length += found;
-            if (found === 0 || text1.substring(textLength - length) ===
-                text2.substring(0, length)) {
-                best = length;
-                length++;
-            }
-        }
-    };
-
-    /**
-     * Split two texts into an array of strings.  Reduce the texts to a string of
-     * hashes where each Unicode character represents one line.
-     * @param {string} text1 First string.
-     * @param {string} text2 Second string.
-     * @return {{chars1: string, chars2: string, lineArray: !Array.<string>}}
-     *     An object containing the encoded text1, the encoded text2 and
-     *     the array of unique strings.
-     *     The zeroth element of the array of unique strings is intentionally blank.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffLinesToChars = function(text1, text2) {
-        var lineArray, lineHash, chars1, chars2;
-        lineArray = []; // e.g. lineArray[4] === 'Hello\n'
-        lineHash = {}; // e.g. lineHash['Hello\n'] === 4
-
-        // '\x00' is a valid character, but various debuggers don't like it.
-        // So we'll insert a junk entry to avoid generating a null character.
-        lineArray[0] = "";
-
-        /**
-         * Split a text into an array of strings.  Reduce the texts to a string of
-         * hashes where each Unicode character represents one line.
-         * Modifies linearray and linehash through being a closure.
-         * @param {string} text String to encode.
-         * @return {string} Encoded string.
-         * @private
-         */
-        function diffLinesToCharsMunge(text) {
-            var chars, lineStart, lineEnd, lineArrayLength, line;
-            chars = "";
-            // Walk the text, pulling out a substring for each line.
-            // text.split('\n') would would temporarily double our memory footprint.
-            // Modifying text would create many large strings to garbage collect.
-            lineStart = 0;
-            lineEnd = -1;
-            // Keeping our own length variable is faster than looking it up.
-            lineArrayLength = lineArray.length;
-            while (lineEnd < text.length - 1) {
-                lineEnd = text.indexOf("\n", lineStart);
-                if (lineEnd === -1) {
-                    lineEnd = text.length - 1;
-                }
-                line = text.substring(lineStart, lineEnd + 1);
-                lineStart = lineEnd + 1;
-
-                if (lineHash.hasOwnProperty ? lineHash.hasOwnProperty(line) :
-                    (lineHash[line] !== undefined)) {
-                    chars += String.fromCharCode( lineHash[ line ] );
-                } else {
-                    chars += String.fromCharCode(lineArrayLength);
-                    lineHash[line] = lineArrayLength;
-                    lineArray[lineArrayLength++] = line;
-                }
-            }
-            return chars;
-        }
-
-        chars1 = diffLinesToCharsMunge(text1);
-        chars2 = diffLinesToCharsMunge(text2);
-        return {
-            chars1: chars1,
-            chars2: chars2,
-            lineArray: lineArray
-        };
-    };
-
-    /**
-     * Rehydrate the text in a diff from a string of line hashes to real lines of
-     * text.
-     * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
-     * @param {!Array.<string>} lineArray Array of unique strings.
-     * @private
-     */
-    DiffMatchPatch.prototype.diffCharsToLines = function( diffs, lineArray ) {
-        var x, chars, text, y;
-        for ( x = 0; x < diffs.length; x++ ) {
-            chars = diffs[x][1];
-            text = [];
-            for ( y = 0; y < chars.length; y++ ) {
-                text[y] = lineArray[chars.charCodeAt(y)];
-            }
-            diffs[x][1] = text.join("");
-        }
-    };
-
-    /**
-     * Reorder and merge like edit sections.  Merge equalities.
-     * Any edit section can move as long as it doesn't cross an equality.
-     * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
-     */
-    DiffMatchPatch.prototype.diffCleanupMerge = function(diffs) {
-        var pointer, countDelete, countInsert, textInsert, textDelete,
-			commonlength, changes;
-        diffs.push( [ DIFF_EQUAL, "" ] ); // Add a dummy entry at the end.
-        pointer = 0;
-        countDelete = 0;
-        countInsert = 0;
-        textDelete = "";
-        textInsert = "";
-        commonlength;
-        while (pointer < diffs.length) {
-            switch ( diffs[ pointer ][ 0 ] ) {
-                case DIFF_INSERT:
-                    countInsert++;
-                    textInsert += diffs[pointer][1];
-                    pointer++;
-                    break;
-                case DIFF_DELETE:
-                    countDelete++;
-                    textDelete += diffs[pointer][1];
-                    pointer++;
-                    break;
-                case DIFF_EQUAL:
-                    // Upon reaching an equality, check for prior redundancies.
-                    if (countDelete + countInsert > 1) {
-                        if (countDelete !== 0 && countInsert !== 0) {
-                            // Factor out any common prefixies.
-                            commonlength = this.diffCommonPrefix(textInsert, textDelete);
-                            if (commonlength !== 0) {
-                                if ((pointer - countDelete - countInsert) > 0 &&
-                                    diffs[pointer - countDelete - countInsert - 1][0] ===
-                                    DIFF_EQUAL) {
-                                    diffs[pointer - countDelete - countInsert - 1][1] +=
-                                        textInsert.substring(0, commonlength);
-                                } else {
-                                    diffs.splice( 0, 0, [ DIFF_EQUAL,
-                                        textInsert.substring( 0, commonlength )
-                                     ] );
-                                    pointer++;
-                                }
-                                textInsert = textInsert.substring(commonlength);
-                                textDelete = textDelete.substring(commonlength);
-                            }
-                            // Factor out any common suffixies.
-                            commonlength = this.diffCommonSuffix(textInsert, textDelete);
-                            if (commonlength !== 0) {
-                                diffs[pointer][1] = textInsert.substring(textInsert.length -
-                                    commonlength) + diffs[pointer][1];
-                                textInsert = textInsert.substring(0, textInsert.length -
-                                    commonlength);
-                                textDelete = textDelete.substring(0, textDelete.length -
-                                    commonlength);
-                            }
-                        }
-                        // Delete the offending records and add the merged ones.
-                        if (countDelete === 0) {
-                            diffs.splice( pointer - countInsert,
-                                countDelete + countInsert, [ DIFF_INSERT, textInsert ] );
-                        } else if (countInsert === 0) {
-                            diffs.splice( pointer - countDelete,
-                                countDelete + countInsert, [ DIFF_DELETE, textDelete ] );
-                        } else {
-                            diffs.splice( pointer - countDelete - countInsert,
-                                countDelete + countInsert, [ DIFF_DELETE, textDelete ], [ DIFF_INSERT, textInsert ] );
-                        }
-                        pointer = pointer - countDelete - countInsert +
-                            (countDelete ? 1 : 0) + (countInsert ? 1 : 0) + 1;
-                    } else if (pointer !== 0 && diffs[pointer - 1][0] === DIFF_EQUAL) {
-                        // Merge this equality with the previous one.
-                        diffs[pointer - 1][1] += diffs[pointer][1];
-                        diffs.splice(pointer, 1);
-                    } else {
-                        pointer++;
-                    }
-                    countInsert = 0;
-                    countDelete = 0;
-                    textDelete = "";
-                    textInsert = "";
-                    break;
-            }
-        }
-        if (diffs[diffs.length - 1][1] === "") {
-            diffs.pop(); // Remove the dummy entry at the end.
-        }
-
-        // Second pass: look for single edits surrounded on both sides by equalities
-        // which can be shifted sideways to eliminate an equality.
-        // e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC
-        changes = false;
-        pointer = 1;
-        // Intentionally ignore the first and last element (don't need checking).
-        while (pointer < diffs.length - 1) {
-            if (diffs[pointer - 1][0] === DIFF_EQUAL &&
-                diffs[pointer + 1][0] === DIFF_EQUAL) {
-                // This is a single edit surrounded by equalities.
-                if ( diffs[ pointer ][ 1 ].substring( diffs[ pointer ][ 1 ].length -
-                        diffs[ pointer - 1 ][ 1 ].length ) === diffs[ pointer - 1 ][ 1 ] ) {
-                    // Shift the edit over the previous equality.
-                    diffs[pointer][1] = diffs[pointer - 1][1] +
-                        diffs[pointer][1].substring(0, diffs[pointer][1].length -
-                            diffs[pointer - 1][1].length);
-                    diffs[pointer + 1][1] = diffs[pointer - 1][1] + diffs[pointer + 1][1];
-                    diffs.splice(pointer - 1, 1);
-                    changes = true;
-                } else if ( diffs[ pointer ][ 1 ].substring( 0, diffs[ pointer + 1 ][ 1 ].length ) ===
-                    diffs[ pointer + 1 ][ 1 ] ) {
-                    // Shift the edit over the next equality.
-                    diffs[pointer - 1][1] += diffs[pointer + 1][1];
-                    diffs[pointer][1] =
-                        diffs[pointer][1].substring(diffs[pointer + 1][1].length) +
-                        diffs[pointer + 1][1];
-                    diffs.splice(pointer + 1, 1);
-                    changes = true;
-                }
-            }
-            pointer++;
-        }
-        // If shifts were made, the diff needs reordering and another shift sweep.
-        if (changes) {
-            this.diffCleanupMerge(diffs);
-        }
-    };
-
-    return function(o, n) {
+		// Cache the text lengths to prevent multiple calls.
+		text1Length = text1.length;
+		text2Length = text2.length;
+		// Eliminate the null case.
+		if ( text1Length === 0 || text2Length === 0 ) {
+			return 0;
+		}
+		// Truncate the longer string.
+		if ( text1Length > text2Length ) {
+			text1 = text1.substring( text1Length - text2Length );
+		} else if ( text1Length < text2Length ) {
+			text2 = text2.substring( 0, text1Length );
+		}
+		textLength = Math.min( text1Length, text2Length );
+		// Quick check for the worst case.
+		if ( text1 === text2 ) {
+			return textLength;
+		}
+
+		// Start by looking for a single character match
+		// and increase length until no match is found.
+		// Performance analysis: http://neil.fraser.name/news/2010/11/04/
+		best = 0;
+		length = 1;
+		while ( true ) {
+			pattern = text1.substring( textLength - length );
+			found = text2.indexOf( pattern );
+			if ( found === -1 ) {
+				return best;
+			}
+			length += found;
+			if ( found === 0 || text1.substring( textLength - length ) ===
+					text2.substring( 0, length ) ) {
+				best = length;
+				length++;
+			}
+		}
+	};
+
+	/**
+	 * Split two texts into an array of strings.  Reduce the texts to a string of
+	 * hashes where each Unicode character represents one line.
+	 * @param {string} text1 First string.
+	 * @param {string} text2 Second string.
+	 * @return {{chars1: string, chars2: string, lineArray: !Array.<string>}}
+	 *     An object containing the encoded text1, the encoded text2 and
+	 *     the array of unique strings.
+	 *     The zeroth element of the array of unique strings is intentionally blank.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffLinesToChars = function( text1, text2 ) {
+		var lineArray, lineHash, chars1, chars2;
+		lineArray = []; // e.g. lineArray[4] === 'Hello\n'
+		lineHash = {}; // e.g. lineHash['Hello\n'] === 4
+
+		// '\x00' is a valid character, but various debuggers don't like it.
+		// So we'll insert a junk entry to avoid generating a null character.
+		lineArray[ 0 ] = "";
+
+		/**
+		 * Split a text into an array of strings.  Reduce the texts to a string of
+		 * hashes where each Unicode character represents one line.
+		 * Modifies linearray and linehash through being a closure.
+		 * @param {string} text String to encode.
+		 * @return {string} Encoded string.
+		 * @private
+		 */
+		function diffLinesToCharsMunge( text ) {
+			var chars, lineStart, lineEnd, lineArrayLength, line;
+			chars = "";
+			// Walk the text, pulling out a substring for each line.
+			// text.split('\n') would would temporarily double our memory footprint.
+			// Modifying text would create many large strings to garbage collect.
+			lineStart = 0;
+			lineEnd = -1;
+			// Keeping our own length variable is faster than looking it up.
+			lineArrayLength = lineArray.length;
+			while ( lineEnd < text.length - 1 ) {
+				lineEnd = text.indexOf( "\n", lineStart );
+				if ( lineEnd === -1 ) {
+					lineEnd = text.length - 1;
+				}
+				line = text.substring( lineStart, lineEnd + 1 );
+				lineStart = lineEnd + 1;
+
+				if ( lineHash.hasOwnProperty ? lineHash.hasOwnProperty( line ) :
+							( lineHash[ line ] !== undefined ) ) {
+					chars += String.fromCharCode( lineHash[ line ] );
+				} else {
+					chars += String.fromCharCode( lineArrayLength );
+					lineHash[ line ] = lineArrayLength;
+					lineArray[ lineArrayLength++ ] = line;
+				}
+			}
+			return chars;
+		}
+
+		chars1 = diffLinesToCharsMunge( text1 );
+		chars2 = diffLinesToCharsMunge( text2 );
+		return {
+			chars1: chars1,
+			chars2: chars2,
+			lineArray: lineArray
+		};
+	};
+
+	/**
+	 * Rehydrate the text in a diff from a string of line hashes to real lines of
+	 * text.
+	 * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
+	 * @param {!Array.<string>} lineArray Array of unique strings.
+	 * @private
+	 */
+	DiffMatchPatch.prototype.diffCharsToLines = function( diffs, lineArray ) {
+		var x, chars, text, y;
+		for ( x = 0; x < diffs.length; x++ ) {
+			chars = diffs[ x ][ 1 ];
+			text = [];
+			for ( y = 0; y < chars.length; y++ ) {
+				text[ y ] = lineArray[ chars.charCodeAt( y ) ];
+			}
+			diffs[ x ][ 1 ] = text.join( "" );
+		}
+	};
+
+	/**
+	 * Reorder and merge like edit sections.  Merge equalities.
+	 * Any edit section can move as long as it doesn't cross an equality.
+	 * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
+	 */
+	DiffMatchPatch.prototype.diffCleanupMerge = function( diffs ) {
+		var pointer, countDelete, countInsert, textInsert, textDelete,
+			commonlength, changes, diffPointer, position;
+		diffs.push( [ DIFF_EQUAL, "" ] ); // Add a dummy entry at the end.
+		pointer = 0;
+		countDelete = 0;
+		countInsert = 0;
+		textDelete = "";
+		textInsert = "";
+		commonlength;
+		while ( pointer < diffs.length ) {
+			switch ( diffs[ pointer ][ 0 ] ) {
+			case DIFF_INSERT:
+				countInsert++;
+				textInsert += diffs[ pointer ][ 1 ];
+				pointer++;
+				break;
+			case DIFF_DELETE:
+				countDelete++;
+				textDelete += diffs[ pointer ][ 1 ];
+				pointer++;
+				break;
+			case DIFF_EQUAL:
+				// Upon reaching an equality, check for prior redundancies.
+				if ( countDelete + countInsert > 1 ) {
+					if ( countDelete !== 0 && countInsert !== 0 ) {
+						// Factor out any common prefixies.
+						commonlength = this.diffCommonPrefix( textInsert, textDelete );
+						if ( commonlength !== 0 ) {
+							if ( ( pointer - countDelete - countInsert ) > 0 &&
+									diffs[ pointer - countDelete - countInsert - 1 ][ 0 ] ===
+									DIFF_EQUAL ) {
+								diffs[ pointer - countDelete - countInsert - 1 ][ 1 ] +=
+									textInsert.substring( 0, commonlength );
+							} else {
+								diffs.splice( 0, 0, [ DIFF_EQUAL,
+									textInsert.substring( 0, commonlength )
+								] );
+								pointer++;
+							}
+							textInsert = textInsert.substring( commonlength );
+							textDelete = textDelete.substring( commonlength );
+						}
+						// Factor out any common suffixies.
+						commonlength = this.diffCommonSuffix( textInsert, textDelete );
+						if ( commonlength !== 0 ) {
+							diffs[ pointer ][ 1 ] = textInsert.substring( textInsert.length -
+									commonlength ) + diffs[ pointer ][ 1 ];
+							textInsert = textInsert.substring( 0, textInsert.length -
+								commonlength );
+							textDelete = textDelete.substring( 0, textDelete.length -
+								commonlength );
+						}
+					}
+					// Delete the offending records and add the merged ones.
+					if ( countDelete === 0 ) {
+						diffs.splice( pointer - countInsert,
+							countDelete + countInsert, [ DIFF_INSERT, textInsert ] );
+					} else if ( countInsert === 0 ) {
+						diffs.splice( pointer - countDelete,
+							countDelete + countInsert, [ DIFF_DELETE, textDelete ] );
+					} else {
+						diffs.splice(
+							pointer - countDelete - countInsert,
+							countDelete + countInsert,
+							[ DIFF_DELETE, textDelete ], [ DIFF_INSERT, textInsert ]
+						);
+					}
+					pointer = pointer - countDelete - countInsert +
+						( countDelete ? 1 : 0 ) + ( countInsert ? 1 : 0 ) + 1;
+				} else if ( pointer !== 0 && diffs[ pointer - 1 ][ 0 ] === DIFF_EQUAL ) {
+
+					// Merge this equality with the previous one.
+					diffs[ pointer - 1 ][ 1 ] += diffs[ pointer ][ 1 ];
+					diffs.splice( pointer, 1 );
+				} else {
+					pointer++;
+				}
+				countInsert = 0;
+				countDelete = 0;
+				textDelete = "";
+				textInsert = "";
+				break;
+			}
+		}
+		if ( diffs[ diffs.length - 1 ][ 1 ] === "" ) {
+			diffs.pop(); // Remove the dummy entry at the end.
+		}
+
+		// Second pass: look for single edits surrounded on both sides by equalities
+		// which can be shifted sideways to eliminate an equality.
+		// e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC
+		changes = false;
+		pointer = 1;
+
+		// Intentionally ignore the first and last element (don't need checking).
+		while ( pointer < diffs.length - 1 ) {
+			if ( diffs[ pointer - 1 ][ 0 ] === DIFF_EQUAL &&
+					diffs[ pointer + 1 ][ 0 ] === DIFF_EQUAL ) {
+
+				diffPointer = diffs[ pointer ][ 1 ];
+				position = diffPointer.substring(
+					diffPointer.length - diffs[ pointer - 1 ][ 1 ].length
+				);
+
+				// This is a single edit surrounded by equalities.
+				if ( position === diffs[ pointer - 1 ][ 1 ] ) {
+
+					// Shift the edit over the previous equality.
+					diffs[ pointer ][ 1 ] = diffs[ pointer - 1 ][ 1 ] +
+						diffs[ pointer ][ 1 ].substring( 0, diffs[ pointer ][ 1 ].length -
+							diffs[ pointer - 1 ][ 1 ].length );
+					diffs[ pointer + 1 ][ 1 ] =
+						diffs[ pointer - 1 ][ 1 ] + diffs[ pointer + 1 ][ 1 ];
+					diffs.splice( pointer - 1, 1 );
+					changes = true;
+				} else if ( diffPointer.substring( 0, diffs[ pointer + 1 ][ 1 ].length ) ===
+						diffs[ pointer + 1 ][ 1 ] ) {
+
+					// Shift the edit over the next equality.
+					diffs[ pointer - 1 ][ 1 ] += diffs[ pointer + 1 ][ 1 ];
+					diffs[ pointer ][ 1 ] =
+						diffs[ pointer ][ 1 ].substring( diffs[ pointer + 1 ][ 1 ].length ) +
+						diffs[ pointer + 1 ][ 1 ];
+					diffs.splice( pointer + 1, 1 );
+					changes = true;
+				}
+			}
+			pointer++;
+		}
+		// If shifts were made, the diff needs reordering and another shift sweep.
+		if ( changes ) {
+			this.diffCleanupMerge( diffs );
+		}
+	};
+
+	return function( o, n ) {
 		var diff, output, text;
-        diff = new DiffMatchPatch();
-        output = diff.DiffMain(o, n);
-        //console.log(output);
-        diff.diffCleanupEfficiency(output);
-        text = diff.diffPrettyHtml(output);
-
-        return text;
-    };
-}());
-// jscs:enable
+		diff = new DiffMatchPatch();
+		output = diff.DiffMain( o, n );
+		diff.diffCleanupEfficiency( output );
+		text = diff.diffPrettyHtml( output );
+
+		return text;
+	};
+}() );
+
+// Get a reference to the global object, like window in browsers
+}( (function() {
+	return this;
+})() ));
 
 (function() {
 
+// Don't load the HTML Reporter on non-Browser environments
+if ( typeof window === "undefined" || !window.document ) {
+	return;
+}
+
 // Deprecated QUnit.init - Ref #530
 // Re-initialize the configuration options
 QUnit.init = function() {
@@ -3115,12 +3383,8 @@ QUnit.init = function() {
 	}
 };
 
-// Don't load the HTML Reporter on non-Browser environments
-if ( typeof window === "undefined" ) {
-	return;
-}
-
 var config = QUnit.config,
+	collapseNext = false,
 	hasOwn = Object.prototype.hasOwnProperty,
 	defined = {
 		document: window.document !== undefined,
@@ -3517,6 +3781,17 @@ function storeFixture() {
 	}
 }
 
+function appendFilteredTest() {
+	var testId = QUnit.config.testId;
+	if ( !testId || testId.length <= 0 ) {
+		return "";
+	}
+	return "<div id='qunit-filteredTest'>Rerunning selected tests: " + testId.join(", ") +
+		" <a id='qunit-clearFilter' href='" +
+		setUrl({ filter: undefined, module: undefined, testId: undefined }) +
+		"'>" + "Run all tests" + "</a></div>";
+}
+
 function appendUserAgent() {
 	var userAgent = id( "qunit-userAgent" );
 
@@ -3524,7 +3799,7 @@ function appendUserAgent() {
 		userAgent.innerHTML = "";
 		userAgent.appendChild(
 			document.createTextNode(
-				"QUnit " + QUnit.version  + "; " + navigator.userAgent
+				"QUnit " + QUnit.version + "; " + navigator.userAgent
 			)
 		);
 	}
@@ -3588,6 +3863,7 @@ QUnit.begin(function( details ) {
 			"<h1 id='qunit-header'>" + escapeText( document.title ) + "</h1>" +
 			"<h2 id='qunit-banner'></h2>" +
 			"<div id='qunit-testrunner-toolbar'></div>" +
+			appendFilteredTest() +
 			"<h2 id='qunit-userAgent'></h2>" +
 			"<ol id='qunit-tests'></ol>";
 	}
@@ -3693,9 +3969,15 @@ QUnit.testStart(function( details ) {
 
 });
 
+function stripHtml( string ) {
+	// strip tags, html entity and whitespaces
+	return string.replace(/<\/?[^>]+(>|$)/g, "").replace(/\&quot;/g, "").replace(/\s+/g, "");
+}
+
 QUnit.log(function( details ) {
 	var assertList, assertLi,
-		message, expected, actual,
+		message, expected, actual, diff,
+		showDiff = false,
 		testItem = id( "qunit-test-output-" + details.testId );
 
 	if ( !testItem ) {
@@ -3710,26 +3992,43 @@ QUnit.log(function( details ) {
 	// when it calls, it's implicit to also not show expected and diff stuff
 	// Also, we need to check details.expected existence, as it can exist and be undefined
 	if ( !details.result && hasOwn.call( details, "expected" ) ) {
-		expected = escapeText( QUnit.dump.parse( details.expected ) );
+		if ( details.negative ) {
+			expected = escapeText( "NOT " + QUnit.dump.parse( details.expected ) );
+		} else {
+			expected = escapeText( QUnit.dump.parse( details.expected ) );
+		}
+
 		actual = escapeText( QUnit.dump.parse( details.actual ) );
 		message += "<table><tr class='test-expected'><th>Expected: </th><td><pre>" +
 			expected +
 			"</pre></td></tr>";
 
 		if ( actual !== expected ) {
+
 			message += "<tr class='test-actual'><th>Result: </th><td><pre>" +
-				actual + "</pre></td></tr>" +
-				"<tr class='test-diff'><th>Diff: </th><td><pre>" +
-				QUnit.diff( expected, actual ) + "</pre></td></tr>";
-		} else {
-			if ( expected.indexOf( "[object Array]" ) !== -1 ||
-					expected.indexOf( "[object Object]" ) !== -1 ) {
-				message += "<tr class='test-message'><th>Message: </th><td>" +
-					"Diff suppressed as the depth of object is more than current max depth (" +
-					QUnit.config.maxDepth + ").<p>Hint: Use <code>QUnit.dump.maxDepth</code> to " +
-					" run with a higher max depth or <a href='" + setUrl({ maxDepth: -1 }) + "'>" +
-					"Rerun</a> without max depth.</p></td></tr>";
+				actual + "</pre></td></tr>";
+
+			// Don't show diff if actual or expected are booleans
+			if ( !( /^(true|false)$/.test( actual ) ) &&
+					!( /^(true|false)$/.test( expected ) ) ) {
+				diff = QUnit.diff( expected, actual );
+				showDiff = stripHtml( diff ).length !==
+					stripHtml( expected ).length +
+					stripHtml( actual ).length;
+			}
+
+			// Don't show diff if expected and actual are totally different
+			if ( showDiff ) {
+				message += "<tr class='test-diff'><th>Diff: </th><td><pre>" +
+					diff + "</pre></td></tr>";
 			}
+		} else if ( expected.indexOf( "[object Array]" ) !== -1 ||
+				expected.indexOf( "[object Object]" ) !== -1 ) {
+			message += "<tr class='test-message'><th>Message: </th><td>" +
+				"Diff suppressed as the depth of object is more than current max depth (" +
+				QUnit.config.maxDepth + ").<p>Hint: Use <code>QUnit.dump.maxDepth</code> to " +
+				" run with a higher max depth or <a href='" + setUrl({ maxDepth: -1 }) + "'>" +
+				"Rerun</a> without max depth.</p></td></tr>";
 		}
 
 		if ( details.source ) {
@@ -3757,7 +4056,7 @@ QUnit.log(function( details ) {
 
 QUnit.testDone(function( details ) {
 	var testTitle, time, testItem, assertList,
-		good, bad, testCounts, skipped,
+		good, bad, testCounts, skipped, sourceName,
 		tests = id( "qunit-tests" );
 
 	if ( !tests ) {
@@ -3781,6 +4080,16 @@ QUnit.testDone(function( details ) {
 	}
 
 	if ( bad === 0 ) {
+
+		// Collapse the passing tests
+		addClass( assertList, "qunit-collapsed" );
+	} else if ( bad && config.collapse && !collapseNext ) {
+
+		// Skip collapsing the first failing test
+		collapseNext = true;
+	} else {
+
+		// Collapse remaining tests
 		addClass( assertList, "qunit-collapsed" );
 	}
 
@@ -3812,10 +4121,31 @@ QUnit.testDone(function( details ) {
 		time.innerHTML = details.runtime + " ms";
 		testItem.insertBefore( time, assertList );
 	}
+
+	// Show the source of the test when showing assertions
+	if ( details.source ) {
+		sourceName = document.createElement( "p" );
+		sourceName.innerHTML = "<strong>Source: </strong>" + details.source;
+		addClass( sourceName, "qunit-source" );
+		if ( bad === 0 ) {
+			addClass( sourceName, "qunit-collapsed" );
+		}
+		addEvent( testTitle, "click", function() {
+			toggleClass( sourceName, "qunit-collapsed" );
+		});
+		testItem.appendChild( sourceName );
+	}
 });
 
 if ( defined.document ) {
-	if ( document.readyState === "complete" ) {
+
+	// Avoid readyState issue with phantomjs
+	// Ref: #818
+	var notPhantom = ( function( p ) {
+		return !( p && p.version && p.version.major > 0 );
+	} )( window.phantom );
+
+	if ( notPhantom && document.readyState === "complete" ) {
 		QUnit.load();
 	} else {
 		addEvent( window, "load", QUnit.load );
diff --git a/js/tests/visual/alert.html b/js/tests/visual/alert.html
index 9e6a939e9..60a140452 100644
--- a/js/tests/visual/alert.html
+++ b/js/tests/visual/alert.html
@@ -6,13 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Alert</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>
 
diff --git a/js/tests/visual/button.html b/js/tests/visual/button.html
index a6eed7e05..a0388e777 100644
--- a/js/tests/visual/button.html
+++ b/js/tests/visual/button.html
@@ -6,13 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Button</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>
 
diff --git a/js/tests/visual/carousel.html b/js/tests/visual/carousel.html
index 47dacaa6a..3930755b7 100644
--- a/js/tests/visual/carousel.html
+++ b/js/tests/visual/carousel.html
@@ -6,13 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Carousel</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>
 
@@ -21,7 +14,7 @@
   <div class="page-header">
     <h1>Carousel <small>Bootstrap Visual Test</small></h1>
   </div>
-
+  <p>Also, the carousel shouldn't slide when its window/tab is hidden. Check the console log.</p>
   <div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
     <ol class="carousel-indicators">
       <li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
@@ -53,6 +46,14 @@
 <script src="../vendor/jquery.min.js"></script>
 <script src="../../dist/util.js"></script>
 <script src="../../dist/carousel.js"></script>
+<script>
+  $(function () {
+    // Test to show that the carousel doesn't slide when the current tab isn't visible
+    $('#carousel-example-generic').on('slid.bs.carousel', function (event) {
+      console.log('slid at ', event.timeStamp);
+    })
+  });
+</script>
 
 </body>
 </html>
diff --git a/js/tests/visual/collapse.html b/js/tests/visual/collapse.html
index 2ccc787ec..a930ab0c6 100644
--- a/js/tests/visual/collapse.html
+++ b/js/tests/visual/collapse.html
@@ -6,13 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Collapse</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>
 
diff --git a/js/tests/visual/dropdown.html b/js/tests/visual/dropdown.html
index 47e400d4b..f0d6f159e 100644
--- a/js/tests/visual/dropdown.html
+++ b/js/tests/visual/dropdown.html
@@ -6,13 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Dropdown</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>
 
diff --git a/js/tests/visual/modal.html b/js/tests/visual/modal.html
index 047916707..2e2f6eb63 100644
--- a/js/tests/visual/modal.html
+++ b/js/tests/visual/modal.html
@@ -6,14 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Modal</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
-
   <style>
     #tall {
       height: 1500px;
diff --git a/js/tests/visual/popover.html b/js/tests/visual/popover.html
index ac6557256..533af2bbd 100644
--- a/js/tests/visual/popover.html
+++ b/js/tests/visual/popover.html
@@ -6,13 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Popover</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>
 
diff --git a/js/tests/visual/scrollspy.html b/js/tests/visual/scrollspy.html
index e8ae05108..dc1dfc82f 100644
--- a/js/tests/visual/scrollspy.html
+++ b/js/tests/visual/scrollspy.html
@@ -6,17 +6,9 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Scrollspy</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
   <style>
     body { padding-top: 70px; }
   </style>
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body data-spy="scroll" data-target=".navbar" data-offset="70">
 
@@ -84,7 +76,6 @@
   <p>Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.</p>
   <p>Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.</p>
   <p>Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.</p>
-  </p>
 
 </div>
 
diff --git a/js/tests/visual/tab.html b/js/tests/visual/tab.html
index 22a918ed7..ae7511f55 100644
--- a/js/tests/visual/tab.html
+++ b/js/tests/visual/tab.html
@@ -6,7 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Tab</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.min.css">
-
   <style>
     h4 {
       margin: 40px 0 10px;
@@ -16,13 +15,6 @@
       margin-bottom: 15px;
     }
   </style>
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>
 
diff --git a/js/tests/visual/tooltip.html b/js/tests/visual/tooltip.html
index 1946dff97..96ede67ef 100644
--- a/js/tests/visual/tooltip.html
+++ b/js/tests/visual/tooltip.html
@@ -6,13 +6,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Tooltip</title>
   <link rel="stylesheet" href="../../../dist/css/bootstrap.css">
-
-  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
-  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
-  <!--[if lt IE 9]>
-    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
-    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
-  <![endif]-->
 </head>
 <body>