longtask-in-childiframe.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-childiframe.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 src="resources/utils.js"></script>

<h1>Long Task in Nested Child Iframe</h1>

<div id="log"></div>

<script>

  promise_test(async (t) => {

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

  const initialTime = performance.now();

  const performanceObserverTimeout = 5 * 1000;

  const longTasksPromise = new Promise(resolve => {

    const observer = new PerformanceObserver(

      t.step_func(function (entryList) {

        const entries = entryList.getEntries();

        entries.forEach(longtask => {

          assert_equals(longtask.entryType, 'longtask');

          if (hasUnrelatedTaskName(longtask.name, 'same-origin-descendant')) {

            return;

          checkLongTaskEntry(longtask, 'same-origin-descendant');

          // Assert the TaskAttributionTiming entry in attribution.

          assert_equals(longtask.attribution.length, 1,

            'Exactly one attribution entry is expected');

          const attribution = longtask.attribution[0];

          assert_equals(attribution.entryType, 'taskattribution');

          assert_equals(attribution.name, 'unknown');

          assert_equals(attribution.duration, 0);

          assert_equals(attribution.startTime, 0);

          assert_equals(attribution.containerType, 'iframe');

          assert_equals(attribution.containerId, 'child-iframe-id');

          assert_equals(attribution.containerName, 'child-iframe-name');

          assert_equals(attribution.containerSrc, 'resources/subframe-with-longtask.html');

          observer.disconnect();

          resolve();

})

})

);

    observer.observe({

      entryTypes: ['longtask']

});

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

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

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

    document.body.appendChild(iframe);

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

});

  const timeout = new Promise(

    (resolve, reject) => t.step_timeout(

      () => {

        reject(new Error('observer failed to find any entries'))

},

      performanceObserverTimeout)

  return Promise.race([longTasksPromise, timeout]);

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

</script>

</body>