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

<!DOCTYPE html>
<script src="utils.js"></script>
<title>A page embedded as a Fenced Frame for COEP tests</title>
<script>
const [uuid] = parseKeylist();
writeValueToServer(uuid, "PASS");
</script>