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diff --git a/wp-includes/js/wp-emoji.js b/wp-includes/js/wp-emoji.js
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+/**
+ * wp-emoji.js is used to replace emoji with images in browsers when the browser
+ * doesn't support emoji natively.
+ *
+ * @output wp-includes/js/wp-emoji.js
+ */
+
+( function( window, settings ) {
+	/**
+	 * Replaces emoji with images when browsers don't support emoji.
+	 *
+	 * @since 4.2.0
+	 * @access private
+	 *
+	 * @class
+	 *
+	 * @see  Twitter Emoji library
+	 * @link https://github.com/twitter/twemoji
+	 *
+	 * @return {Object} The wpEmoji parse and test functions.
+	 */
+	function wpEmoji() {
+		var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver,
+
+		// Compression and maintain local scope.
+		document = window.document,
+
+		// Private.
+		twemoji, timer,
+		loaded = false,
+		count = 0,
+		ie11 = window.navigator.userAgent.indexOf( 'Trident/7.0' ) > 0;
+
+		/**
+		 * Detect if the browser supports SVG.
+		 *
+		 * @since 4.6.0
+		 * @private
+		 *
+		 * @see Modernizr
+		 * @link https://github.com/Modernizr/Modernizr/blob/master/feature-detects/svg/asimg.js
+		 *
+		 * @return {boolean} True if the browser supports svg, false if not.
+		 */
+		function browserSupportsSvgAsImage() {
+			if ( !! document.implementation.hasFeature ) {
+				return document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' );
+			}
+
+			// document.implementation.hasFeature is deprecated. It can be presumed
+			// if future browsers remove it, the browser will support SVGs as images.
+			return true;
+		}
+
+		/**
+		 * Runs when the document load event is fired, so we can do our first parse of
+		 * the page.
+		 *
+		 * Listens to all the DOM mutations and checks for added nodes that contain
+		 * emoji characters and replaces those with twitter emoji images.
+		 *
+		 * @since 4.2.0
+		 * @private
+		 */
+		function load() {
+			if ( loaded ) {
+				return;
+			}
+
+			// Ensure twemoji is available on the global window before proceeding.
+			if ( typeof window.twemoji === 'undefined' ) {
+				// Break if waiting for longer than 30 seconds.
+				if ( count > 600 ) {
+					return;
+				}
+
+				// Still waiting.
+				window.clearTimeout( timer );
+				timer = window.setTimeout( load, 50 );
+				count++;
+
+				return;
+			}
+
+			twemoji = window.twemoji;
+			loaded = true;
+
+			// Initialize the mutation observer, which checks all added nodes for
+			// replaceable emoji characters.
+			if ( MutationObserver ) {
+				new MutationObserver( function( mutationRecords ) {
+					var i = mutationRecords.length,
+						addedNodes, removedNodes, ii, node;
+
+					while ( i-- ) {
+						addedNodes = mutationRecords[ i ].addedNodes;
+						removedNodes = mutationRecords[ i ].removedNodes;
+						ii = addedNodes.length;
+
+						/*
+						 * Checks if an image has been replaced by a text element
+						 * with the same text as the alternate description of the replaced image.
+						 * (presumably because the image could not be loaded).
+						 * If it is, do absolutely nothing.
+						 *
+						 * Node type 3 is a TEXT_NODE.
+						 *
+						 * @link https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
+						 */
+						if (
+							ii === 1 && removedNodes.length === 1 &&
+							addedNodes[0].nodeType === 3 &&
+							removedNodes[0].nodeName === 'IMG' &&
+							addedNodes[0].data === removedNodes[0].alt &&
+							'load-failed' === removedNodes[0].getAttribute( 'data-error' )
+						) {
+							return;
+						}
+
+						// Loop through all the added nodes.
+						while ( ii-- ) {
+							node = addedNodes[ ii ];
+
+							// Node type 3 is a TEXT_NODE.
+							if ( node.nodeType === 3 ) {
+								if ( ! node.parentNode ) {
+									continue;
+								}
+
+								if ( ie11 ) {
+									/*
+									 * IE 11's implementation of MutationObserver is buggy.
+									 * It unnecessarily splits text nodes when it encounters a HTML
+									 * template interpolation symbol ( "{{", for example ). So, we
+									 * join the text nodes back together as a work-around.
+									 *
+									 * Node type 3 is a TEXT_NODE.
+									 */
+									while( node.nextSibling && 3 === node.nextSibling.nodeType ) {
+										node.nodeValue = node.nodeValue + node.nextSibling.nodeValue;
+										node.parentNode.removeChild( node.nextSibling );
+									}
+								}
+
+								node = node.parentNode;
+							}
+
+							if ( test( node.textContent ) ) {
+								parse( node );
+							}
+						}
+					}
+				} ).observe( document.body, {
+					childList: true,
+					subtree: true
+				} );
+			}
+
+			parse( document.body );
+		}
+
+		/**
+		 * Tests if a text string contains emoji characters.
+		 *
+		 * @since 4.3.0
+		 *
+		 * @memberOf wp.emoji
+		 *
+		 * @param {string} text The string to test.
+		 *
+		 * @return {boolean} Whether the string contains emoji characters.
+		 */
+		function test( text ) {
+			// Single char. U+20E3 to detect keycaps. U+00A9 "copyright sign" and U+00AE "registered sign" not included.
+			var single = /[\u203C\u2049\u20E3\u2122\u2139\u2194-\u2199\u21A9\u21AA\u2300\u231A\u231B\u2328\u2388\u23CF\u23E9-\u23F3\u23F8-\u23FA\u24C2\u25AA\u25AB\u25B6\u25C0\u25FB-\u25FE\u2600-\u2604\u260E\u2611\u2614\u2615\u2618\u261D\u2620\u2622\u2623\u2626\u262A\u262E\u262F\u2638\u2639\u263A\u2648-\u2653\u2660\u2663\u2665\u2666\u2668\u267B\u267F\u2692\u2693\u2694\u2696\u2697\u2699\u269B\u269C\u26A0\u26A1\u26AA\u26AB\u26B0\u26B1\u26BD\u26BE\u26C4\u26C5\u26C8\u26CE\u26CF\u26D1\u26D3\u26D4\u26E9\u26EA\u26F0-\u26F5\u26F7-\u26FA\u26FD\u2702\u2705\u2708-\u270D\u270F\u2712\u2714\u2716\u271D\u2721\u2728\u2733\u2734\u2744\u2747\u274C\u274E\u2753\u2754\u2755\u2757\u2763\u2764\u2795\u2796\u2797\u27A1\u27B0\u27BF\u2934\u2935\u2B05\u2B06\u2B07\u2B1B\u2B1C\u2B50\u2B55\u3030\u303D\u3297\u3299]/,
+			// Surrogate pair range. Only tests for the second half.
+			pair = /[\uDC00-\uDFFF]/;
+
+			if ( text ) {
+				return  pair.test( text ) || single.test( text );
+			}
+
+			return false;
+		}
+
+		/**
+		 * Parses any emoji characters into Twemoji images.
+		 *
+		 * - When passed an element the emoji characters are replaced inline.
+		 * - When passed a string the emoji characters are replaced and the result is
+		 *   returned.
+		 *
+		 * @since 4.2.0
+		 *
+		 * @memberOf wp.emoji
+		 *
+		 * @param {HTMLElement|string} object The element or string to parse.
+		 * @param {Object}             args   Additional options for Twemoji.
+		 *
+		 * @return {HTMLElement|string} A string where all emoji are now image tags of
+		 *                              emoji. Or the element that was passed as the first argument.
+		 */
+		function parse( object, args ) {
+			var params;
+
+			/*
+			 * If the browser has full support, twemoji is not loaded or our
+			 * object is not what was expected, we do not parse anything.
+			 */
+			if ( settings.supports.everything || ! twemoji || ! object ||
+				( 'string' !== typeof object && ( ! object.childNodes || ! object.childNodes.length ) ) ) {
+
+				return object;
+			}
+
+			// Compose the params for the twitter emoji library.
+			args = args || {};
+			params = {
+				base: browserSupportsSvgAsImage() ? settings.svgUrl : settings.baseUrl,
+				ext:  browserSupportsSvgAsImage() ? settings.svgExt : settings.ext,
+				className: args.className || 'emoji',
+				callback: function( icon, options ) {
+					// Ignore some standard characters that TinyMCE recommends in its character map.
+					switch ( icon ) {
+						case 'a9':
+						case 'ae':
+						case '2122':
+						case '2194':
+						case '2660':
+						case '2663':
+						case '2665':
+						case '2666':
+							return false;
+					}
+
+					if ( settings.supports.everythingExceptFlag &&
+						! /^1f1(?:e[6-9a-f]|f[0-9a-f])-1f1(?:e[6-9a-f]|f[0-9a-f])$/.test( icon ) && // Country flags.
+						! /^(1f3f3-fe0f-200d-1f308|1f3f4-200d-2620-fe0f)$/.test( icon )             // Rainbow and pirate flags.
+					) {
+						return false;
+					}
+
+					return ''.concat( options.base, icon, options.ext );
+				},
+				attributes: function() {
+					return {
+						role: 'img'
+					};
+				},
+				onerror: function() {
+					if ( twemoji.parentNode ) {
+						this.setAttribute( 'data-error', 'load-failed' );
+						twemoji.parentNode.replaceChild( document.createTextNode( twemoji.alt ), twemoji );
+					}
+				},
+				doNotParse: function( node ) {
+					if (
+						node &&
+						node.className &&
+						typeof node.className === 'string' &&
+						node.className.indexOf( 'wp-exclude-emoji' ) !== -1
+					) {
+						// Do not parse this node. Emojis will not be replaced in this node and all sub-nodes.
+						return true;
+					}
+
+					return false;
+				}
+			};
+
+			if ( typeof args.imgAttr === 'object' ) {
+				params.attributes = function() {
+					return args.imgAttr;
+				};
+			}
+
+			return twemoji.parse( object, params );
+		}
+
+		/**
+		 * Initialize our emoji support, and set up listeners.
+		 */
+		if ( settings ) {
+			if ( settings.DOMReady ) {
+				load();
+			} else {
+				settings.readyCallback = load;
+			}
+		}
+
+		return {
+			parse: parse,
+			test: test
+		};
+	}
+
+	window.wp = window.wp || {};
+
+	/**
+	 * @namespace wp.emoji
+	 */
+	window.wp.emoji = new wpEmoji();
+
+} )( window, window._wpemojiSettings );