Broke the logic for .clean() wrap out into a separate, static, data structure. Also improved the performance of .html() looking for the case where .innerHTML can be used without problems. Also tweaked some cases where cleanData() was used, no need to use jQuery selectors in these cases.

src/manipulation.js

@@ -2,14 +2,32 @@ var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 	rleadingWhitespace = /^\s+/,
 	rxhtmlTag = /(<(\w+)[^>]*?)\/>/g,
 	rselfClosing = /^(?:abbr|br|col|img|input|link|meta|param|hr|area|embed)$/i,
-	rinsideTable = /^<(thead|tbody|tfoot|colg|cap)/,
+	rtagName = /<(\w+)/,
 	rtbody = /<tbody/i,
 	fcloseTag = function(all, front, tag){
 		return rselfClosing.test(tag) ?
 			all :
 			front + "></" + tag + ">";
+	},
+	wrapMap = {
+		option: [ 1, "<select multiple='multiple'>", "</select>" ],
+		legend: [ 1, "<fieldset>", "</fieldset>" ],
+		thead: [ 1, "<table>", "</table>" ],
+		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
+		td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],
+		col: [ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ],
+		_default: [ 0, "", "" ]
 	};
 
+wrapMap.optgroup = wrapMap.option;
+wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
+wrapMap.th = wrapMap.td;
+
+// IE can't serialize <link> and <script> tags normally
+if ( !jQuery.support.htmlSerialize ) {
+	wrapMap._default = [ 1, "div<div>", "</div>" ];
+}
+
 jQuery.fn.extend({
 	text: function( text ) {
 		if ( typeof text !== "object" && text !== undefined )
@@ -149,11 +167,29 @@ jQuery.fn.extend({
 	},
 
 	html: function( value ) {
-		return value === undefined ?
-			(this[0] ?
+		if ( value === undefined ) {
+			return this[0] ?
 				this[0].innerHTML.replace(rinlinejQuery, "") :
-				null) :
+				null;
+
+		// See if we can take a shortcut and just use innerHTML
+		} else if ( typeof value === "string" && !/<script/i.test( value ) &&
+			!wrapMap[ (rtagName.exec( value ) || ["", ""])[1].toLowerCase() ] ) {
+
+			for ( var i = 0, l = this.length; i < l; i++ ) {
+				// Remove element nodes and prevent memory leaks
+				if ( this[i].nodeType === 1 ) {
+					cleanData( this[i].getElementsByTagName("*") );
+				}
+
+				this[i].innerHTML = value;
+			}
+
+		} else {
 			this.empty().append( value );
+		}
+
+		return this;
 	},
 
 	replaceWith: function( value ) {
@@ -269,7 +305,8 @@ jQuery.each({
 	remove: function( selector, keepData ) {
 		if ( !selector || jQuery.multiFilter( selector, [ this ] ).length ) {
 			if ( !keepData && this.nodeType === 1 ) {
-				cleanData( jQuery("*", this).add(this) );
+				cleanData( this.getElementsByTagName("*") );
+				cleanData( [ this ] );
 			}
 
 			if ( this.parentNode ) {
@@ -281,7 +318,7 @@ jQuery.each({
 	empty: function() {
 		// Remove element nodes and prevent memory leaks
 		if ( this.nodeType === 1 ) {
-			cleanData( jQuery("*", this) );
+			cleanData( this.getElementsByTagName("*") );
 		}
 
 		// Remove any remaining nodes
@@ -319,41 +356,15 @@ jQuery.extend({
 				elem = elem.replace(rxhtmlTag, fcloseTag);
 
 				// Trim whitespace, otherwise indexOf won't work as expected
-				var tags = elem.replace(rleadingWhitespace, "")
-					.substring(0, 10).toLowerCase();
-
-				var wrap =
-					// option or optgroup
-					!tags.indexOf("<opt") &&
-					[ 1, "<select multiple='multiple'>", "</select>" ] ||
-
-					!tags.indexOf("<leg") &&
-					[ 1, "<fieldset>", "</fieldset>" ] ||
-
-					rinsideTable.test(tags) &&
-					[ 1, "<table>", "</table>" ] ||
-
-					!tags.indexOf("<tr") &&
-					[ 2, "<table><tbody>", "</tbody></table>" ] ||
-
-				 	// <thead> matched above
-					(!tags.indexOf("<td") || !tags.indexOf("<th")) &&
-					[ 3, "<table><tbody><tr>", "</tr></tbody></table>" ] ||
-
-					!tags.indexOf("<col") &&
-					[ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ] ||
-
-					// IE can't serialize <link> and <script> tags normally
-					!jQuery.support.htmlSerialize &&
-					[ 1, "div<div>", "</div>" ] ||
-
-					[ 0, "", "" ];
+				var tag = (rtagName.exec( elem ) || ["", ""])[1].toLowerCase(),
+					wrap = wrapMap[ tag ] || wrapMap._default,
+					depth = wrap[0];
 
 				// Go to html and back, then peel off extra wrappers
 				div.innerHTML = wrap[1] + elem + wrap[2];
 
 				// Move to the right depth
-				while ( wrap[0]-- ) {
+				while ( depth-- ) {
 					div = div.lastChild;
 				}
 
@@ -362,7 +373,7 @@ jQuery.extend({
 
 					// String was a <table>, *may* have spurious <tbody>
 					var hasBody = rtbody.test(elem),
-						tbody = !tags.indexOf("<table") && !hasBody ?
+						tbody = tag === "table" && !hasBody ?
 							div.firstChild && div.firstChild.childNodes :
 
 							// String was a bare <thead> or <tfoot>