dispose-skip-current-on-truncate.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/per-entry-events/dispose-skip-current-on-truncate.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

<script src="/resources/testharnessreport.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(r => window.onload = () => t.step_timeout(r, 0));

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

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

  let iframe = document.createElement("iframe");

  iframe.src = "/common/blank.html";

  document.body.appendChild(iframe);

  await new Promise(r => iframe.onload = () => t.step_timeout(r, 0));

  assert_equals(iframe.contentWindow.navigation.entries().length, 1);

  // Go back to before the iframe was added. The iframe will still be in the

  // document, but we will be at a joint session history entry that was created

  // before the iframe was added to the document.

  await navigation.back().finished;

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

  assert_equals(iframe.contentWindow.navigation.entries().length, 1);

  assert_equals(navigation.currentEntry.index, start_index);

  assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);

  // A push navigation in the top window will truncate-then-push the joint

  // session history. This should dispose the forward entry in the top window,

  // but should not interfere with the currentEntry in the iframe.

  let dispose_promise = new Promise(r => navigation.entries()[start_index + 1].ondispose = r);

  iframe.contentWindow.navigation.currentEntry.ondispose = t.unreached_func("iframe entry must not be disposed");

  await navigation.navigate("#b").finished;

  await dispose_promise;

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

  assert_equals(iframe.contentWindow.navigation.entries().length, 1);

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

  assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);

}, "Removing a currentEntry from the joint session history shouldn't dispose it");

</script>