jquery core: Closes #3255. The div used in jQuery.clean is emptied in the end....

jquery core: Closes #3255. The div used in jQuery.clean is emptied in the end. Cleaning the parentNode's properties of the elements.

src/core.js

@@ -909,13 +909,14 @@ jQuery.extend({
 	},
 
 	clean: function( elems, context, fragment ) {
-		var ret = [], scripts = [];
 		context = context || document;
 
 		// !context.createElement fails in IE with an error but returns typeof 'object'
 		if ( typeof context.createElement === "undefined" )
 			context = context.ownerDocument || context[0] && context[0].ownerDocument || document;
 
+		var ret = [], scripts = [], div = context.createElement("div");
+
 		jQuery.each(elems, function(i, elem){
 			if ( typeof elem === "number" )
 				elem += '';
@@ -933,7 +934,7 @@ jQuery.extend({
 				});
 
 				// Trim whitespace, otherwise indexOf won't work as expected
-				var tags = jQuery.trim( elem ).toLowerCase(), div = context.createElement("div");
+				var tags = jQuery.trim( elem ).toLowerCase();
 
 				var wrap =
 					// option or optgroup
@@ -1009,6 +1010,9 @@ jQuery.extend({
 				ret = jQuery.merge( ret, elem );
 
 		});
+
+		// Clean up
+		div.innerHTML = "";
 		
 		if ( fragment ) {
 			for ( var i = 0; ret[i]; i++ ) {

test/unit/core.js

@@ -451,7 +451,7 @@ test("attr(Hash)", function() {
 });
 
 test("attr(String, Object)", function() {
-	expect(17);
+	expect(19);
 	var div = jQuery("div").attr("foo", "bar");
 		fail = false;
 	for ( var i = 0; i < div.size(); i++ ) {
@@ -515,6 +515,16 @@ test("attr(String, Object)", function() {
 	}
 	ok( thrown, "Exception thrown when trying to change type property" );
 	equals( "checkbox", jQuery(check).attr('type'), "Verify that you can change the type of an input element that isn't in the DOM" );
+	
+	var check = jQuery("<input />");
+	var thrown = true;
+	try {
+		check.attr('type','checkbox');
+	} catch(e) {
+		thrown = false;
+	}
+	ok( thrown, "Exception thrown when trying to change type property" );
+	equals( "checkbox", check.attr('type'), "Verify that you can change the type of an input element that isn't in the DOM" );
 });
 
 if ( !isLocal ) {
@@ -1139,6 +1149,8 @@ test("is(String)", function() {
 });
 
 test("jQuery.merge()", function() {
+	expect(6);
+		
 	var parse = jQuery.merge;
 	
 	same( parse([],[]), [], "Empty arrays" );