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

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>LongTask Timing: long task in external script</title>

<body>

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

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

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

<h1>Long Task: External Script</h1>

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

<script>

promise_test(function(t) {

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

  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, 'self')) {

            return;

          checkLongTaskEntry(longtask);

          // 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, 'window');

          assert_equals(attribution.containerId, '');

          assert_equals(attribution.containerName, '');

          assert_equals(attribution.containerSrc, '');

          observer.disconnect();

          resolve();

})

      }));

    observer.observe({

      entryTypes: ['longtask']

});

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

    script.src = 'resources/makelongtask.js';

    document.body.appendChild(script);

});

  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 are observable.');

</script>

</body>