navigation-back-cross-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-cross-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 src="/common/get-host-info.sub.js"></script>

<script>

promise_test(async t => {

  // Wait for after the load event so that the navigation doesn't get converted

  // into a replace navigation.

  let w = window.open("resources/opener-postMessage-onload.html");

  await new Promise(resolve => window.onmessage = resolve);

  // Navigate to a url that will notify us when the navigation is complete.

  w.navigation.navigate("opener-postMessage-onload.html?1");

  await new Promise(resolve => window.onmessage = resolve);

  assert_equals(w.navigation.entries().length, 2);

  assert_equals(w.navigation.currentEntry.index, 1);

  let navigate_called = false;

  w.navigation.onnavigate = t.step_func(e => {

    navigate_called = true;

    assert_false(e.destination.sameDocument);

    assert_false(e.cancelable);

    // Should do nothing.

    e.preventDefault();

});

  w.navigation.back();

  await new Promise(resolve => window.onmessage = resolve);

  assert_equals(w.navigation.currentEntry.index, 0);

  assert_true(navigate_called);

}, "navigation.back() cross-document cannot be cancelled with the navigate event");

</script>