detachEvent is unnecessary since we're nulling div. Fixes #8873.

src/support.js

@@ -109,11 +109,10 @@ jQuery.support = (function() {
 	}
 
 	if ( !div.addEventListener && div.attachEvent && div.fireEvent ) {
-		div.attachEvent( "onclick", function click() {
+		div.attachEvent( "onclick", function() {
 			// Cloning a node shouldn't copy over any
 			// bound event handlers (IE does this)
 			support.noCloneEvent = false;
-			div.detachEvent( "onclick", click );
 		});
 		div.cloneNode( true ).fireEvent( "onclick" );
 	}