nav-cancelation-1.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:
- /html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-1.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Parent main frame cancels a same-origin child whose navigation is pending</title>

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

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

<!--

  This test asserts that a parent canceling a same-origin child's cross-origin

  navigation does not result in load events firing synchronously in the parent

-->

<body>

<iframe src=resources/slow.py></iframe>

<script>

promise_test(async t => {

  let window_load_fired = false;

  let iframe_load_fired = false;

  const iframe = document.querySelector('iframe');

  const window_load_promise = new Promise(resolve => {

    window.onload = () => {

      window_load_fired = true;

      resolve();

});

  const iframe_onload_promise = new Promise(resolve => {

    iframe.onload = () => {

      iframe_load_fired = true;

      resolve();

});

  // While the child navigation is in-flight, cancel it and record when the

  // parent `load` event fires.

  window.frames[0].location.href = "resources/slow.py?different";

  // Synchronously after cancelation, no load events should have been fired.

  assert_false(window_load_fired,

    "Parent's load event does not synchronously fire after cancelation");

  assert_false(iframe_load_fired,

    "<iframe> load event does not synchronously fire after cancelation");

  // Load events did not fire in a microtask after cancelation.

  await Promise.resolve();

  assert_false(window_load_fired,

      "Parent's load event does not fire in the microtask after cancelation");

  assert_false(iframe_load_fired,

      "<iframe> load event does not fire in the microtask after cancelation");

  // Canceling the navigation should unblock the parent's load event, but the

  // new iframe navigation should still be pending, and the iframe load event

  // shouldn't fire until *that one* is complete.

  await window_load_promise;

  assert_true(window_load_fired,

      "Parent's load event fires asynchronously after child navigation cancelation");

  assert_false(iframe_load_fired,

      "<iframe> load event does not fire until subsequent navigation is complete");

}, "parent cancels a pending navigation in a same-origin child");

</script>