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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>LongTask Timing: long tasks in various containers</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<h1>Longtasks in iframe, frame, object, and embed</h1>
<div id="log"></div>
<script>
function Container(name, src) {
this.name = name;
this.src = src;
}
const Containers = [
new Container('iframe', 'src'),
new Container('frame', 'src'),
new Container('object', 'data'),
new Container('embed', 'src'),
];
Containers.forEach(container => {
promise_test(async t => {
assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
const initialTime = performance.now();
const performanceObserverTimeout = 5 * 1000;
const testLongTaskEntry = new Promise(resolve => {
const observer = new PerformanceObserver(t.step_func(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.containerId, container.name + '-id');
assert_equals(attribution.containerName, container.name + '-name');
assert_equals(attribution.containerSrc, 'resources/subframe-with-longtask.html');
observer.disconnect();
resolve();
});
}));
observer.observe({ entryTypes: ['longtask'], buffered: false });
const containerObject = document.createElement(container.name);
containerObject.id = container.name + '-id';
containerObject.name = container.name + '-name';
containerObject[container.src] = 'resources/subframe-with-longtask.html';
document.body.appendChild(containerObject);
});
const timeout = new Promise(
(resolve, reject) => t.step_timeout(
() => { reject(new Error('observer failed to find any entries')) },
performanceObserverTimeout)
);
return Promise.race([testLongTaskEntry, timeout]);
}, `Performance longtask entries in ${container.name} are observable in parent.`);
});
</script>
</body>
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