closest polyfill

closest-polyfill.js

;(function(Element) {

    // matches polyfill
    if (!Element.prototype.matches) {
        Element.prototype.matches = Element.prototype.matchesSelector ||
        Element.prototype.webkitMatchesSelector ||
        Element.prototype.mozMatchesSelector ||
        Element.prototype.msMatchesSelector ||
        function matches(selector) {
            var element = this,
                elements = (element.document || element.ownerDocument).querySelectorAll(selector),
                index = 0;

            while (elements[index] && elements[index] !== element) {
                ++index;
            }

            return elements[index] ? true : false;
        };
    };

    //closest polyfill
    if (!Element.prototype.closest) {
        Element.prototype.closest = function(selector) {
            var node = this;

            while (node) {
                if (node.matches(selector)) return node;
                else node = node.parentElement;
            }
            return null;
        };
    }
})(Element);