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<!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="resources/utils.js"></script>
<h1>Long Task in Nested Child Iframe</h1>
<div id="log"></div>
<script>
promise_test(async (t) => {
assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
const initialTime = performance.now();
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, '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.containerType, 'iframe');
assert_equals(attribution.containerId, 'child-iframe-id');
assert_equals(attribution.containerName, 'child-iframe-name');
assert_equals(attribution.containerSrc, 'resources/subframe-with-longtask.html');
observer.disconnect();
resolve();
})
})
);
observer.observe({
entryTypes: ['longtask']
});
const iframe = document.createElement('iframe');
iframe.id = 'child-iframe-id';
iframe.name = 'child-iframe-name';
document.body.appendChild(iframe);
iframe.src = 'resources/subframe-with-longtask.html';
});
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 in child iframe are observable in parent.');
</script>
</body>
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