<html>
<head>
<script>
window.onload = function() {
  document.getElementById('theForm').submit();
  try {
    parent.attacked();
  } catch(ex) {
    console.log(ex);
  }
  parent.postMessage('Done.', '*');
};
</script>
</head>
</script>
<body>
<form id="theForm" action="about:blank" method="GET"></form>
</body>
</html>