navigation-back-same-document-preventDefault.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/navigation-back-same-document-preventDefault.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

<script src="../navigation-methods/return-value/resources/helpers.js"></script>

<script>

promise_test(async t => {

  let start_length = navigation.entries().length;

  let start_index = navigation.currentEntry.index;

  // 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;

  assert_equals(navigation.entries().length, start_length + 1);

  assert_equals(navigation.currentEntry.index, start_index + 1);

  navigation.onnavigate = e => e.preventDefault();

  navigation.onnavigateerror = t.step_func(e => {

    assert_equals(e.constructor, ErrorEvent);

    assert_equals(e.filename, location.href);

    navigateerror_called = true;

});

  await assertBothRejectDOM(t, navigation.back(), "AbortError");

  assert_equals(navigation.currentEntry.index, start_index + 1);

  assert_true(navigateerror_called);

}, "navigation.back() same-document preventDefault");

</script>