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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: 9a2e7a8ddcd0c2bb7475d31c92a5d61705ca1f2f authored by Andrea Marchesini on 04 April 2018, 17:49:15 UTC
Update the StructuredCloneAlgorithm to follow the latest version of the spec,
Tip revision: 9a2e7a8
longtask-in-sibling-iframe-crossorigin.html 
<!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>
  async_test(t => {
    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'], 'script');
      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'

    /* 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';
    // Simulate cross-origin by using sandbox.
    longtaskFrame.sandbox = "allow-scripts";
    document.body.appendChild(longtaskFrame);
    longtaskFrame.src = 'resources/subframe-with-longtask.html'
}, 'Performance longtask entries from cross-origin iframe are observable in its sibling.');
</script>
</body>
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