<!DOCTYPE HTML>
<meta charset=utf-8>
<title>LongTask Timing: long task in external script</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<h1>Long Task: External Script</h1>
<div id="log"></div>
<script>
promise_test(function(t) {
assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
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, 'self')) {
return;
}
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();
resolve();
})
}));
observer.observe({
entryTypes: ['longtask']
});
const script = document.createElement('script');
script.src = 'resources/makelongtask.js';
document.body.appendChild(script);
});
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 are observable.');
</script>
</body>
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