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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/resources/fenced-frame-loaded.html 

<!DOCTYPE html>
<html>
<script src="utils.js"></script>
<title>Fenced frame loaded</title>
<body>
<script>
(async function() {
  const [parent_key] = parseKeylist();
  writeValueToServer(parent_key, "fenced frame loaded");
})();
</script>
</body>
</html>