text: /**
   * Array#sort callback to sort nodes by DOM order
   * @private
   * @param  {Node} nodeA
   * @param  {Node} nodeB
   * @return {Integer}   @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Sort
   */
  axe.utils.nodeSorter = function nodeSorter(nodeA, nodeB) {
  	/*eslint no-bitwise: 0 */
  	nodeA = nodeA.actualNode || nodeA;
  	nodeB = nodeB.actualNode || nodeB;
  	if (nodeA === nodeB) {
  		return 0;
  	}
  
  	if (nodeA.compareDocumentPosition(nodeB) & 4) {
  		return -1; // a before b
  	} else {
  		return 1; // b before a
  	}
  };
  