navigate-destination-after-detach.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-destination-after-detach.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 => {

  // 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));

  let destination_key = i.contentWindow.navigation.currentEntry.key;

  let destination_id = i.contentWindow.navigation.currentEntry.id;

  let destination_index = i.contentWindow.navigation.currentEntry.index;

  await i.contentWindow.navigation.navigate("#1").finished;

  let back_destination;

  i.contentWindow.navigation.onnavigate = e => back_destination = e.destination;

  await i.contentWindow.navigation.back().finished;

  // Before detach, key/id/index are valid.

  assert_equals(back_destination.key, destination_key);

  assert_equals(back_destination.id, destination_id);

  assert_equals(back_destination.index, destination_index);

  i.remove();

  // After detach, key/id/index are invalid, but the url is still valid.

  assert_equals(back_destination.key, "");

  assert_equals(back_destination.id, "");

  assert_equals(new URL(back_destination.url).pathname, "/common/blank.html");

  assert_equals(back_destination.index, -1);

}, "navigate event destination after iframe detach");

</script>