| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>LongTask Timing: validate long task attributes</title> |
| <body> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/utils.js"></script> |
| |
| <h1>Long Task Attributes</h1> |
| <div id="log"></div> |
| <script> |
| async_test(function (t) { |
| assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.'); |
| const observer = new PerformanceObserver( |
| t.step_func(function (entryList) { |
| const entries = entryList.getEntries(); |
| assert_equals(entries.length, 1, |
| 'Exactly one entry is expected.'); |
| const longtask = entries[0]; |
| 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(); |
| t.done(); |
| }) |
| ); |
| observer.observe({entryTypes: ['longtask']}); |
| |
| window.onload = () => { |
| /* Generate a slow task */ |
| const begin = window.performance.now(); |
| while (window.performance.now() < begin + 60); |
| }; |
| }, 'Performance longtask entries are observable.'); |
| </script> |
| |
| </body> |