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diff --git a/wp-includes/js/shortcode.js b/wp-includes/js/shortcode.js
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+/**
+ * Utility functions for parsing and handling shortcodes in JavaScript.
+ *
+ * @output wp-includes/js/shortcode.js
+ */
+
+/**
+ * Ensure the global `wp` object exists.
+ *
+ * @namespace wp
+ */
+window.wp = window.wp || {};
+
+(function(){
+	wp.shortcode = {
+		/*
+		 * ### Find the next matching shortcode.
+		 *
+		 * Given a shortcode `tag`, a block of `text`, and an optional starting
+		 * `index`, returns the next matching shortcode or `undefined`.
+		 *
+		 * Shortcodes are formatted as an object that contains the match
+		 * `content`, the matching `index`, and the parsed `shortcode` object.
+		 */
+		next: function( tag, text, index ) {
+			var re = wp.shortcode.regexp( tag ),
+				match, result;
+
+			re.lastIndex = index || 0;
+			match = re.exec( text );
+
+			if ( ! match ) {
+				return;
+			}
+
+			// If we matched an escaped shortcode, try again.
+			if ( '[' === match[1] && ']' === match[7] ) {
+				return wp.shortcode.next( tag, text, re.lastIndex );
+			}
+
+			result = {
+				index:     match.index,
+				content:   match[0],
+				shortcode: wp.shortcode.fromMatch( match )
+			};
+
+			// If we matched a leading `[`, strip it from the match
+			// and increment the index accordingly.
+			if ( match[1] ) {
+				result.content = result.content.slice( 1 );
+				result.index++;
+			}
+
+			// If we matched a trailing `]`, strip it from the match.
+			if ( match[7] ) {
+				result.content = result.content.slice( 0, -1 );
+			}
+
+			return result;
+		},
+
+		/*
+		 * ### Replace matching shortcodes in a block of text.
+		 *
+		 * Accepts a shortcode `tag`, content `text` to scan, and a `callback`
+		 * to process the shortcode matches and return a replacement string.
+		 * Returns the `text` with all shortcodes replaced.
+		 *
+		 * Shortcode matches are objects that contain the shortcode `tag`,
+		 * a shortcode `attrs` object, the `content` between shortcode tags,
+		 * and a boolean flag to indicate if the match was a `single` tag.
+		 */
+		replace: function( tag, text, callback ) {
+			return text.replace( wp.shortcode.regexp( tag ), function( match, left, tag, attrs, slash, content, closing, right ) {
+				// If both extra brackets exist, the shortcode has been
+				// properly escaped.
+				if ( left === '[' && right === ']' ) {
+					return match;
+				}
+
+				// Create the match object and pass it through the callback.
+				var result = callback( wp.shortcode.fromMatch( arguments ) );
+
+				// Make sure to return any of the extra brackets if they
+				// weren't used to escape the shortcode.
+				return result ? left + result + right : match;
+			});
+		},
+
+		/*
+		 * ### Generate a string from shortcode parameters.
+		 *
+		 * Creates a `wp.shortcode` instance and returns a string.
+		 *
+		 * Accepts the same `options` as the `wp.shortcode()` constructor,
+		 * containing a `tag` string, a string or object of `attrs`, a boolean
+		 * indicating whether to format the shortcode using a `single` tag, and a
+		 * `content` string.
+		 */
+		string: function( options ) {
+			return new wp.shortcode( options ).string();
+		},
+
+		/*
+		 * ### Generate a RegExp to identify a shortcode.
+		 *
+		 * The base regex is functionally equivalent to the one found in
+		 * `get_shortcode_regex()` in `wp-includes/shortcodes.php`.
+		 *
+		 * Capture groups:
+		 *
+		 * 1. An extra `[` to allow for escaping shortcodes with double `[[]]`.
+		 * 2. The shortcode name.
+		 * 3. The shortcode argument list.
+		 * 4. The self closing `/`.
+		 * 5. The content of a shortcode when it wraps some content.
+		 * 6. The closing tag.
+		 * 7. An extra `]` to allow for escaping shortcodes with double `[[]]`.
+		 */
+		regexp: _.memoize( function( tag ) {
+			return new RegExp( '\\[(\\[?)(' + tag + ')(?![\\w-])([^\\]\\/]*(?:\\/(?!\\])[^\\]\\/]*)*?)(?:(\\/)\\]|\\](?:([^\\[]*(?:\\[(?!\\/\\2\\])[^\\[]*)*)(\\[\\/\\2\\]))?)(\\]?)', 'g' );
+		}),
+
+
+		/*
+		 * ### Parse shortcode attributes.
+		 *
+		 * Shortcodes accept many types of attributes. These can chiefly be
+		 * divided into named and numeric attributes:
+		 *
+		 * Named attributes are assigned on a key/value basis, while numeric
+		 * attributes are treated as an array.
+		 *
+		 * Named attributes can be formatted as either `name="value"`,
+		 * `name='value'`, or `name=value`. Numeric attributes can be formatted
+		 * as `"value"` or just `value`.
+		 */
+		attrs: _.memoize( function( text ) {
+			var named   = {},
+				numeric = [],
+				pattern, match;
+
+			/*
+			 * This regular expression is reused from `shortcode_parse_atts()`
+			 * in `wp-includes/shortcodes.php`.
+			 *
+			 * Capture groups:
+			 *
+			 * 1. An attribute name, that corresponds to...
+			 * 2. a value in double quotes.
+			 * 3. An attribute name, that corresponds to...
+			 * 4. a value in single quotes.
+			 * 5. An attribute name, that corresponds to...
+			 * 6. an unquoted value.
+			 * 7. A numeric attribute in double quotes.
+			 * 8. A numeric attribute in single quotes.
+			 * 9. An unquoted numeric attribute.
+			 */
+			pattern = /([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*'([^']*)'(?:\s|$)|([\w-]+)\s*=\s*([^\s'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|'([^']*)'(?:\s|$)|(\S+)(?:\s|$)/g;
+
+			// Map zero-width spaces to actual spaces.
+			text = text.replace( /[\u00a0\u200b]/g, ' ' );
+
+			// Match and normalize attributes.
+			while ( (match = pattern.exec( text )) ) {
+				if ( match[1] ) {
+					named[ match[1].toLowerCase() ] = match[2];
+				} else if ( match[3] ) {
+					named[ match[3].toLowerCase() ] = match[4];
+				} else if ( match[5] ) {
+					named[ match[5].toLowerCase() ] = match[6];
+				} else if ( match[7] ) {
+					numeric.push( match[7] );
+				} else if ( match[8] ) {
+					numeric.push( match[8] );
+				} else if ( match[9] ) {
+					numeric.push( match[9] );
+				}
+			}
+
+			return {
+				named:   named,
+				numeric: numeric
+			};
+		}),
+
+		/*
+		 * ### Generate a Shortcode Object from a RegExp match.
+		 *
+		 * Accepts a `match` object from calling `regexp.exec()` on a `RegExp`
+		 * generated by `wp.shortcode.regexp()`. `match` can also be set
+		 * to the `arguments` from a callback passed to `regexp.replace()`.
+		 */
+		fromMatch: function( match ) {
+			var type;
+
+			if ( match[4] ) {
+				type = 'self-closing';
+			} else if ( match[6] ) {
+				type = 'closed';
+			} else {
+				type = 'single';
+			}
+
+			return new wp.shortcode({
+				tag:     match[2],
+				attrs:   match[3],
+				type:    type,
+				content: match[5]
+			});
+		}
+	};
+
+
+	/*
+	 * Shortcode Objects
+	 * -----------------
+	 *
+	 * Shortcode objects are generated automatically when using the main
+	 * `wp.shortcode` methods: `next()`, `replace()`, and `string()`.
+	 *
+	 * To access a raw representation of a shortcode, pass an `options` object,
+	 * containing a `tag` string, a string or object of `attrs`, a string
+	 * indicating the `type` of the shortcode ('single', 'self-closing',
+	 * or 'closed'), and a `content` string.
+	 */
+	wp.shortcode = _.extend( function( options ) {
+		_.extend( this, _.pick( options || {}, 'tag', 'attrs', 'type', 'content' ) );
+
+		var attrs = this.attrs;
+
+		// Ensure we have a correctly formatted `attrs` object.
+		this.attrs = {
+			named:   {},
+			numeric: []
+		};
+
+		if ( ! attrs ) {
+			return;
+		}
+
+		// Parse a string of attributes.
+		if ( _.isString( attrs ) ) {
+			this.attrs = wp.shortcode.attrs( attrs );
+
+		// Identify a correctly formatted `attrs` object.
+		} else if ( _.difference( _.keys( attrs ), [ 'named', 'numeric' ] ).length === 0 ) {
+			this.attrs = _.defaults( attrs, this.attrs );
+
+		// Handle a flat object of attributes.
+		} else {
+			_.each( options.attrs, function( value, key ) {
+				this.set( key, value );
+			}, this );
+		}
+	}, wp.shortcode );
+
+	_.extend( wp.shortcode.prototype, {
+		/*
+		 * ### Get a shortcode attribute.
+		 *
+		 * Automatically detects whether `attr` is named or numeric and routes
+		 * it accordingly.
+		 */
+		get: function( attr ) {
+			return this.attrs[ _.isNumber( attr ) ? 'numeric' : 'named' ][ attr ];
+		},
+
+		/*
+		 * ### Set a shortcode attribute.
+		 *
+		 * Automatically detects whether `attr` is named or numeric and routes
+		 * it accordingly.
+		 */
+		set: function( attr, value ) {
+			this.attrs[ _.isNumber( attr ) ? 'numeric' : 'named' ][ attr ] = value;
+			return this;
+		},
+
+		// ### Transform the shortcode match into a string.
+		string: function() {
+			var text    = '[' + this.tag;
+
+			_.each( this.attrs.numeric, function( value ) {
+				if ( /\s/.test( value ) ) {
+					text += ' "' + value + '"';
+				} else {
+					text += ' ' + value;
+				}
+			});
+
+			_.each( this.attrs.named, function( value, name ) {
+				text += ' ' + name + '="' + value + '"';
+			});
+
+			// If the tag is marked as `single` or `self-closing`, close the
+			// tag and ignore any additional content.
+			if ( 'single' === this.type ) {
+				return text + ']';
+			} else if ( 'self-closing' === this.type ) {
+				return text + ' /]';
+			}
+
+			// Complete the opening tag.
+			text += ']';
+
+			if ( this.content ) {
+				text += this.content;
+			}
+
+			// Add the closing tag.
+			return text + '[/' + this.tag + ']';
+		}
+	});
+}());
+
+/*
+ * HTML utility functions
+ * ----------------------
+ *
+ * Experimental. These functions may change or be removed in the future.
+ */
+(function(){
+	wp.html = _.extend( wp.html || {}, {
+		/*
+		 * ### Parse HTML attributes.
+		 *
+		 * Converts `content` to a set of parsed HTML attributes.
+		 * Utilizes `wp.shortcode.attrs( content )`, which is a valid superset of
+		 * the HTML attribute specification. Reformats the attributes into an
+		 * object that contains the `attrs` with `key:value` mapping, and a record
+		 * of the attributes that were entered using `empty` attribute syntax (i.e.
+		 * with no value).
+		 */
+		attrs: function( content ) {
+			var result, attrs;
+
+			// If `content` ends in a slash, strip it.
+			if ( '/' === content[ content.length - 1 ] ) {
+				content = content.slice( 0, -1 );
+			}
+
+			result = wp.shortcode.attrs( content );
+			attrs  = result.named;
+
+			_.each( result.numeric, function( key ) {
+				if ( /\s/.test( key ) ) {
+					return;
+				}
+
+				attrs[ key ] = '';
+			});
+
+			return attrs;
+		},
+
+		// ### Convert an HTML-representation of an object to a string.
+		string: function( options ) {
+			var text = '<' + options.tag,
+				content = options.content || '';
+
+			_.each( options.attrs, function( value, attr ) {
+				text += ' ' + attr;
+
+				// Convert boolean values to strings.
+				if ( _.isBoolean( value ) ) {
+					value = value ? 'true' : 'false';
+				}
+
+				text += '="' + value + '"';
+			});
+
+			// Return the result if it is a self-closing tag.
+			if ( options.single ) {
+				return text + ' />';
+			}
+
+			// Complete the opening tag.
+			text += '>';
+
+			// If `content` is an object, recursively call this function.
+			text += _.isObject( content ) ? wp.html.string( content ) : content;
+
+			return text + '</' + options.tag + '>';
+		}
+	});
+}());