cross-origin-ancestor-activeelement-after-child-lose-focus-helper.html

<html>
<body>
  <input />
  <script>
    window.onload = function() {
      document.querySelector("input").focus();
      window.parent.parent.postMessage("ready", '*');
    }
  </script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/focus/support/cross-origin-ancestor-activeelement-after-child-lose-focus-helper.html