longtask-in-sibling-iframe-crossorigin.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:
- /longtask-timing/longtask-in-sibling-iframe-crossorigin.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>LongTask Timing: long task in cross-origin sibling iframe</title>

<body>

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

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

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

<script>

  const sibling_url = new URL("resources/subframe-with-longtask.html",

                              new URL(location.pathname,

                                      get_host_info().HTTPS_REMOTE_ORIGIN)).href;

  async_test(t => {

    assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');

    window.addEventListener('message', t.step_func(e => {

      assert_equals(e.data['entryType'], 'longtask');

      assert_equals(e.data['frame-attribution'], 'cross-origin-unreachable');

      assert_equals(e.data['task-attribution'], 'unknown');

      assert_equals(e.data['containerType'], 'window');

      assert_equals(e.data['containerId'], '');

      assert_equals(e.data['containerName'], '');

      assert_equals(e.data['containerSrc'], '');

      t.done();

    }));

    const observingFrame = document.createElement('iframe');

    observingFrame.id = 'observing-iframe-id';

    observingFrame.name = 'observing-iframe-name';

    document.body.appendChild(observingFrame);

    observingFrame.src = 'resources/subframe-observing-longtask.html'

    observingFrame.onload = () => {

      /* Create a cross-origin iframe that generates a long task. */

      const longtaskFrame = document.createElement('iframe');

      longtaskFrame.id = 'longtask-iframe-id';

      longtaskFrame.name = 'longtask-iframe-name';

      document.body.appendChild(longtaskFrame);

      longtaskFrame.src = sibling_url;

};

}, 'Performance longtask entries from cross-origin iframe are observable in its sibling.');

</script>

</body>