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

* Mark a function for special use by Sizzle * @param {Function} fn The function to mark

* Returns a function to use in pseudos for positionals * @param {Function} fn

* Adds the same handler for all of the specified attrs * @param {String} attrs Pipe-separated list of attributes * @param {Function} handler The met

* Create key-value caches of limited size * @returns {function(string, object)} Returns the Object data after storing it on itself with * property n

* Checks a node for validity as a Sizzle context * @param {Element|Object=} context * @returns {Element|Object|Boolean} The input node if acceptable