--- /dev/null
+define([
+ "../../core",
+ "../../selector"
+ // css is assumed
+], function( jQuery ) {
+
+ return function( elem, el ) {
+ // isHidden might be called from jQuery#filter function;
+ // in that case, element will be second argument
+ elem = el || elem;
+ return jQuery.css( elem, "display" ) === "none" || !jQuery.contains( elem.ownerDocument, elem );
+ };
+});