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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/resources/window-frameElement-inner.html 

<!DOCTYPE html>
<script src="utils.js"></script>
<title>Fenced frame content to report the value of window.frameElement</title>

<body>
<script>
(async () => {
  // Report whether or not `window.frameElement` is null
  const [frame_element_key] = parseKeylist();
  let result = (window.frameElement == null) ? "PASS" : "FAIL";
  writeValueToServer(frame_element_key, result);
})();
</script>
</body>