/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">

<script>
  (function() {
    'use strict';

    var p = Element.prototype;
    var matches = p.matches || p.matchesSelector || p.mozMatchesSelector ||
      p.msMatchesSelector || p.oMatchesSelector || p.webkitMatchesSelector;

    Polymer.IronFocusablesHelper = {

      /**
       * Returns a sorted array of tabbable nodes, including the root node.
       * It searches the tabbable nodes in the light and shadow dom of the chidren,
       