longtask-in-parentiframe.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-parentiframe.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>LongTask Timing: long task in nested child iframe</title>

<body>

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

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

<script>

  const t = 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'], 'same-origin-ancestor');

      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();

    }));

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

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

  iframe.id = 'child-iframe-id';

  iframe.name = 'child-iframe-name';

  document.body.appendChild(iframe);

  iframe.src = 'resources/subframe-observing-longtask.html';

  iframe.onload = () => {

    t.step_timeout( () => {

      const begin = window.performance.now();

      while (window.performance.now() < begin + 60);

    }, 50);

};

</script>

</body>