| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>LongTask Timing: synchronous XHR</title> |
| <body> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/utils.js"></script> |
| <link rel="stylesheet" href="/resource-timing/resources/delay-css.py?delay=1000" /> |
| <h1>Long Task: Spin event loop</h1> |
| <div id="log"></div> |
| <script> |
| setup(() => assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.')); |
| |
| promise_test(async t => { |
| const didReceiveLongTask = false; |
| new PerformanceObserver(() => { |
| didReceiveLongTask = true; |
| }).observe({entryTypes: ['longtask']}); |
| |
| await new Promise(resolve => window.addEventListener('load', resolve)); |
| assert_false(didReceiveLongTask); |
| }, 'Waiting for load event (spinning an event loop), is not a longtask'); |
| </script> |
| </body> |
