IE11 polyfill's: matches, closest, forEach

polyfills.js

(function () {

    // matches
    if (!Element.prototype.matches) {
        Element.prototype.matches = Element.prototype.matchesSelector ||
            Element.prototype.webkitMatchesSelector ||
            Element.prototype.mozMatchesSelector ||
            Element.prototype.msMatchesSelector;
    }

    // closest
    if (!Element.prototype.closest) {
        Element.prototype.closest = function (css) {
            var node = this;
            while (node) {
                if (node.matches(css)) return node;
                else node = node.parentElement;
            }
            return null;
        };
    }

    // forEach
    if (!Array.prototype.forEach) {
        Array.prototype.forEach = function (callback, thisArg) {
            thisArg = thisArg || window;
            for (var i = 0; i < this.length; i++) {
                callback.call(thisArg, this[i], i, this);
            }
        };
    }
    if (typeof NodeList.prototype.forEach !== "function") {
        NodeList.prototype.forEach = Array.prototype.forEach;
    }

})();