function getAllElementsByXpath(xpath) {
  var results = [];
  var query = document.evaluate(xpath, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
  for (var i = 0, length = query.snapshotLength; i < length; ++i) {
    results.push(query.snapshotItem(i));
  }
  return results;
}