<!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>