<iframe></iframe>
<a href='about:blank'></a>
<script>
  if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
  }
  let iframe = document.querySelector('iframe');
  let link = document.querySelector('a');
  iframe.contentWindow.addEventListener('unload', function() {
    link.click();
  });
  location.href = './resources/pass-and-notify-done.html';
</script>