| <!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> |
| |
| <h1>Long Task: synchronous XHR</h1> |
| <div id="log"></div> |
| <script> |
| setup(() => assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.')); |
| |
| promise_test(async t => { |
| const receivedLongTask = new Promise(resolve => |
| new PerformanceObserver(entries => resolve(entries.getEntries())).observe({entryTypes: ['longtask']})); |
| await new Promise(resolve => window.addEventListener('load', () => { |
| const xhr = new XMLHttpRequest(); |
| xhr.open('GET', '/resource-timing/resources/delay-css.py?delay=100', false /* synchronous xhr */); |
| xhr.send(); |
| resolve(); |
| })); |
| const entries = await receivedLongTask; |
| assert_equals(entries.length, 1); |
| }, 'A long synchronous XHR is a longtask'); |
| </script> |
| </body> |
