* @param {HTMLElement} elt * @param {string} attributeName * @returns {string | null}

* @param {HTMLElement} elt * @param {string} selector * @returns {boolean}

ServeHTTP implements the http.Handler interface.

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

* @param {HTMLElement} elt * @returns {HTMLElement | null}