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+<!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>