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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/window-navigation-204.https.html 

<!DOCTYPE html>
<title>Test window.navigation.204</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>
promise_test(async () => {
  const window_data_key = token();

  attachFencedFrame(generateURL("resources/window-navigation-204-inner.html",
      [window_data_key]));

  const actual_result  = await nextValueFromServer(window_data_key);
  assert_equals(actual_result, "still in page",
                "The fenced frame has the right value for `204 response` upon " +
                "subsequent navigation resulting in HTTP 204");
}, "window.navigation.204");
</script>

</body>