longtask-in-sibling-iframe.html

Enable keyboard shortcuts

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.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

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

<body>

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

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

<script>

  async_test(t => {

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

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

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

      // Ignore any long task that may be produced by the top-level frame.

      if (e.data['frame-attribution'] === 'same-origin-ancestor')

        return;

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

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

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

      assert_equals(e.data['containerId'], 'longtask-iframe-id');

      assert_equals(e.data['containerName'], 'longtask-iframe-name');

      assert_equals(e.data['containerSrc'], 'resources/subframe-with-longtask.html');

      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 = () => {

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

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

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

      document.body.appendChild(longtaskFrame);

      longtaskFrame.src = 'resources/subframe-with-longtask.html'

};

}, 'Performance longtask entries are observable in sibling iframe.');

</script>

</body>