closest shim

closest.shim.js

(function (elProto) {
    if (elProto.hasOwnProperty('closest')) {
        return;
    }

    elProto.matches = elProto.matches || elProto.webkitMatchesSelector || elProto.mozMatchesSelector || elProto.msMatchesSelector || elProto.oMatchesSelector;

    elProto.closest = function closest (selector) {
        var element = this;

        while (element) {
            if (element.matches(selector)) {
                break;
            }

            element = element.parentElement;
        }

        return element;
    };
})(Element.prototype);