Function assert

2.0.3/2.0.3.js:1195–1210

* Support testing using an element * @param {Function} fn Passed the created div and expects a boolean result

( fn )

         * @param {Function} fn Passed the created div and expects a boolean result
         */
        function assert( fn ) {
            var div = document.createElement("div");

            try {
                return !!fn( div );
            } catch (e) {
                return false;
            } finally {
                // Remove from its parent by default
                if ( div.parentNode ) {
                    div.parentNode.removeChild( div );
                }
                // release memory in IE
                div = null;
            }
        }

        /**
         * Adds the same handler for all of the specified attrs