Function assert

2.0.3/Sizzle.js:330–345

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

(fn)

         */

        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