text: if (!Element.prototype.matches) {
    Element.prototype.matches =
      Element.prototype.matchesSelector ||
      Element.prototype.mozMatchesSelector ||
      Element.prototype.msMatchesSelector ||
      Element.prototype.oMatchesSelector ||
      Element.prototype.webkitMatchesSelector ||
      function(s) {
        var matches = (this.document || this.ownerDocument).querySelectorAll(s),
          i = matches.length;
        while (--i >= 0 && matches.item(i) !== this) {}
        return i > -1;
      };
  }