<!DOCTYPE html>
<title>Navigate ancestor helper from nested fenced frame</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="utils.js"></script>

<body>
<script>
(async () => {
  // This document is loaded into a fenced frame by
  // `navigate-ancestor-test-runner.https.html`. It creates a nested iframe and
  // navigates it to `navigate-ancestor-helper.https.html`.

  // navigate_ancestor_from_nested_key sent by us to our embedder to
  // indicate that an message was sent from the nested iframe when it failed to
  // navigate the ancestor (this) frame.
  const [navigate_ancestor_key, navigate_ancestor_from_nested_key,
      ancestor_type] = parseKeylist();

  // An message should be sent from the iframe.
  window.addEventListener('message', (e) => {
    window.onbeforeunload = null;
    writeValueToServer(
        navigate_ancestor_from_nested_key,
        `PASS: [${ancestor_type}] ${e.data}`);
  });

  // When the iframe tries to navigate its ancestor frame, it should not
  // navigate *this* frame, because the sandboxed navigation browsing context
  // flag [1] must be set in fenced frame trees.
  // [1] https://html.spec.whatwg.org/multipage/origin.html#sandboxed-navigation-browsing-context-flag
  const iframe = document.createElement('iframe');
  iframe.src = generateURL(`navigate-ancestor-helper.https.html`,
      [navigate_ancestor_key, ancestor_type]);
  document.body.append(iframe);
})();
</script>
</body>
