| <!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> |
| async_test(t => { |
| window.addEventListener("message", t.step_func(e => { |
| assert_equals(e.data, "longtask+same-origin-ancestor+frame"); |
| t.done(); |
| })); |
| }, "Performance longtask entries in parent are observable in child iframe"); |
| </script> |
| |
| <iframe src="resources/subframe-observing-longtask.html" id="child-iframe-id" name="child-iframe-name"></iframe> |
| |
| <script> |
| setTimeout(function(){ |
| var begin = window.performance.now(); |
| while (window.performance.now() < begin + 51); |
| }, 50); |
| </script> |
| |
| </body> |
