testing/web-platform/tests/focus/support/cross-origin-ancestor-activeelement-after-child-lose-focus-helper.html


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