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chromium/third_party/blink/web_tests/external/wpt/shared-storage/resources/frame0.html 

<!DOCTYPE html>
<html>
<script src="/fenced-frame/resources/utils.js"></script>
<body>
<script>
async function init() {
  const [ancestor_key] = parseKeylist();
  writeValueToServer(ancestor_key, "frame0_loaded");
}

init();
</script>
</body>
</html>