navigation-api/navigate-event/navigation-traverseTo-top-cancels-cross-document-child.html

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../navigation-methods/return-value/resources/helpers.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<script>
promise_test(async t => {
  // Wait for after the load event so that the navigation doesn't get converted
  // into a replace navigation.
  await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
  await navigation.navigate("#").finished;
  i.contentWindow.navigation.navigate("?");
  await new Promise(resolve => i.onload = () => t.step_timeout(resolve, 0));

  assert_equals(navigation.entries().length, 2);
  assert_equals(i.contentWindow.navigation.entries().length, 2);
  assert_equals(navigation.currentEntry.index, 1);
  assert_equals(i.contentWindow.navigation.currentEntry.index, 1);

  navigation.onnavigate = t.step_func(e => e.preventDefault());
  i.contentWindow.navigation.onnavigate = t.unreached_func("navigation should be cancelled before iframe fires navigate event");
  await assertBothRejectDOM(t, navigation.traverseTo(navigation.entries()[0].key), "AbortError");
  // Give the iframe time to navigate in case it was incorrectly permitted.
  await new Promise(resolve => t.step_timeout(resolve, 50));
}, "navigate.traverseTo() cancelled by top frame cancels cross-document iframe");
</script>