navigate-history-back-noop.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /navigation-api/navigate-event/navigate-history-back-noop.html - WPT Dashboard Interop Dashboard

<!doctype html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<iframe id="i" src="/common/blank.html"></iframe>

<script>

promise_test(async t => {

  let start_length = navigation.entries().length;

  let start_index = navigation.currentEntry.index;

  let start_history_length = history.length;

  // 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 i.contentWindow.navigation.navigate("#").finished;

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

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

  assert_equals(navigation.entries().length, start_length);

  assert_equals(navigation.currentEntry.index, start_index);

  assert_equals(history.length, start_history_length + 1);

  i.remove();

  assert_equals(navigation.entries().length, start_length);

  assert_equals(navigation.currentEntry.index, start_index);

  assert_equals(history.length, start_history_length + 1);

  // back() here should do nothing. The iframe that would have navigated has

  // been removed. No navigate event should be fired.

  navigation.onnavigate = t.unreached_func("navigate must not fire");

  navigation.oncurrententrychange = t.unreached_func("currententrychange must not fire");

  history.back();

  // Give time for the navigation to proceed.

  await new Promise(resolve => t.step_timeout(resolve, 20));

}, "history.back() does not fire a navigate event when there's nothing to navigate");

</script>