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

<!DOCTYPE html>
<meta http-equiv="Content-Security-Policy" content="frame-src 'self'">
<title>Test Content-Security-Policy fenced-frame-src falling back to frame-src</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<script src="/common/utils.js"></script>

<body>
<script>
const key = token();

promise_test(async () => {
  attachFencedFrame(generateURL(
      "resources/csp-frame-src-allowed-inner.html",
      [key]));
  const result = await nextValueFromServer(key);
  assert_equals(result, "loaded",
                "The fenced frame is loaded as expected");
}, "csp-frame-src-allowed");
</script>
</body>