longtask-in-childiframe-crossorigin.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-crossorigin.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="/common/get-host-info.sub.js"></script>

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

<h1>Long Task in Nested Cross-Origin Child Iframe</h1>

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

<script>

  const child_url = new URL("resources/subframe-with-longtask.html",

                            new URL(location.pathname,

                                    get_host_info().HTTPS_REMOTE_ORIGIN)).href;

  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];

            assert_equals(longtask.entryType, 'longtask');

            if (longtask.name == 'self' ||

                longtask.name == 'multiple-contexts' ||

                longtask.name == 'unknown')

              return;

            checkLongTaskEntry(longtask, 'cross-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, child_url);

            observer.disconnect();

            t.done();

})

);

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

    window.onload = () => {

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

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

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

        document.body.appendChild(iframe);

        iframe.src = child_url;

};

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

</script>

</body>