Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/fenced-frame/resources/csp-frame-src-allowed-inner.html 

<!DOCTYPE html>
<script src="utils.js"></script>
<title>Page embedded as a fenced frame</title>
<script>
  const [key] = parseKeylist();
  writeValueToServer(key, "loaded");
</script>