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diff --git a/ui/focusable.js b/ui/focusable.js
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+++ b/ui/focusable.js
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+/*!
+ * jQuery UI Focusable @VERSION
+ * http://jqueryui.com
+ *
+ * Copyright jQuery Foundation and other contributors
+ * Released under the MIT license.
+ * http://jquery.org/license
+ */
+
+//>>label: focusable
+//>>group: Core
+//>>description: Selects elements which can be focused.
+//>>docs: http://api.jqueryui.com/focusable-selector/
+
+( function( factory ) {
+	if ( typeof define === "function" && define.amd ) {
+
+		// AMD. Register as an anonymous module.
+		define( [ "jquery", "./version" ], factory );
+	} else {
+
+		// Browser globals
+		factory( jQuery );
+	}
+} ( function( $ ) {
+
+// selectors
+$.ui.focusable = function( element, hasTabindex ) {
+	var map, mapName, img,
+		nodeName = element.nodeName.toLowerCase();
+	if ( "area" === nodeName ) {
+		map = element.parentNode;
+		mapName = map.name;
+		if ( !element.href || !mapName || map.nodeName.toLowerCase() !== "map" ) {
+			return false;
+		}
+		img = $( "img[usemap='#" + mapName + "']" )[ 0 ];
+		return !!img && visible( img );
+	}
+	return ( /^(input|select|textarea|button|object)$/.test( nodeName ) ?
+		!element.disabled :
+		"a" === nodeName ?
+			element.href || hasTabindex :
+			hasTabindex ) &&
+		// the element and all of its ancestors must be visible
+		visible( element );
+};
+
+function visible( element ) {
+	return $.expr.filters.visible( element ) &&
+		!$( element ).parents().addBack().filter( function() {
+			return $.css( this, "visibility" ) === "hidden";
+		} ).length;
+}
+
+$.extend( $.expr[ ":" ], {
+	focusable: function( element ) {
+		return $.ui.focusable( element, $.attr( element, "tabindex" ) != null );
+	}
+} );
+
+return $.ui.focusable;
+
+} ) );