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50 lines
1.9 KiB
HTML
50 lines
1.9 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>LongTask Timing: long task in external script</title>
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<body>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<h1>Long Task: External Script</h1>
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<div id="log"></div>
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<script>
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async_test(function (t) {
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if (typeof PerformanceLongTaskTiming === 'undefined') {
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assert_unreached("Longtasks are not supported.");
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t.done();
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}
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const observer = new PerformanceObserver(
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t.step_func(function (entryList) {
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const entries = entryList.getEntries();
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assert_equals(entries.length, 1,
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'Exactly one entry is expected.');
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const longtask = entries[0];
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assert_equals(longtask.entryType, 'longtask');
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assert_equals(longtask.name, 'self');
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assert_greater_than(longtask.duration, 50);
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// Assert the TaskAttributionTiming entry in attribution.
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assert_equals(longtask.attribution.length, 1,
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'Exactly one attribution entry is expected');
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const attribution = longtask.attribution[0];
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assert_equals(attribution.entryType, 'taskattribution');
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assert_equals(attribution.name, 'unknown');
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assert_equals(attribution.duration, 0);
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assert_equals(attribution.startTime, 0);
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assert_equals(attribution.containerId, '');
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assert_equals(attribution.containerName, '');
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assert_equals(attribution.containerSrc, '');
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observer.disconnect();
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t.done();
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})
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);
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observer.observe({entryTypes: ['longtask']});
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window.onload = () => {
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const script = document.createElement('script');
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script.src = 'resources/makelongtask.js';
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document.body.appendChild(script);
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}
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}, 'Performance longtask entries are observable.');
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</script>
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</body>
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