longtask-attributes.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-attributes.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>LongTask Timing: validate long task attributes</title>

<body>

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

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

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

<h1>Long Task Attributes</h1>

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

<script>

  async_test(function (t) {

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

    const observer = new PerformanceObserver(

        t.step_func(function (entryList) {

            const entries = entryList.getEntries();

            assert_equals(entries.length, 1,

                'Exactly one entry is expected.');

            const longtask = entries[0];

            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();

            t.done();

})

);

    observer.observe({entryTypes: ['longtask']});

    window.onload = () => {

        /* Generate a slow task */

        const begin = window.performance.now();

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

};

}, 'Performance longtask entries are observable.');

</script>

</body>