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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/navigator-keyboard-lock.https.html 

<!DOCTYPE html>
<title>Test navigator.keyboard.lock</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 keyboard_lock_key = token();

  attachFencedFrame(generateURL(
      "resources/navigator-keyboard-lock-inner.html",
      [keyboard_lock_key]));
  const actual_result = await nextValueFromServer(keyboard_lock_key);

  assert_equals(actual_result, "rejected",
                "The fenced frame is not allowed to lock keyboard.");

}, "keyboard.lock");
</script>

</body>