| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>LongTask Timing: long task in nested child iframe</title> |
| <body> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/utils.js"></script> |
| |
| <h1>Long Tasks with detached iframe</h1> |
| <div id="log"></div> |
| <script> |
| promise_test(async t => { |
| assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.'); |
| const iframe = document.createElement("iframe"); |
| document.body.appendChild(iframe); |
| t.add_cleanup(() => iframe.remove()); |
| t.step_timeout(() => { |
| busyWait(); |
| iframe.remove(); |
| }); |
| }, 'Performance longtask entries dont crash when a frame is detached.'); |
| </script> |
| |
| </body> |
