| <!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> |
| |
| <h1>Long Task in Nested Child Iframe</h1> |
| <div id="log"></div> |
| <script> |
| const initialTime = performance.now(); |
| async_test(function (t) { |
| if (typeof PerformanceLongTaskTiming === 'undefined') { |
| assert_unreached("Longtasks are not supported."); |
| t.done(); |
| } |
| 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]; |
| assert_equals(longtask.entryType, 'longtask'); |
| if (longtask.name == 'self' || |
| longtask.name == 'multiple-contexts' || |
| longtask.name == 'unknown') |
| return; |
| |
| assert_equals(longtask.name, 'same-origin-descendant'); |
| assert_greater_than(longtask.duration, 50); |
| assert_greater_than_equal(longtask.startTime, initialTime); |
| const currentTime = performance.now(); |
| assert_less_than_equal(longtask.startTime, currentTime); |
| |
| // 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.containerId, 'child-iframe-id'); |
| assert_equals(attribution.containerName, 'child-iframe-name'); |
| assert_equals(attribution.containerSrc, 'resources/subframe-with-longtask.html'); |
| observer.disconnect(); |
| t.done(); |
| }) |
| ); |
| observer.observe({entryTypes: ['longtask']}); |
| window.onload = () => { |
| const iframe = document.createElement('iframe'); |
| iframe.id = 'child-iframe-id'; |
| iframe.name = 'child-iframe-name'; |
| document.body.appendChild(iframe); |
| iframe.src = 'resources/subframe-with-longtask.html'; |
| }; |
| }, 'Performance longtask entries in child iframe are observable in parent.'); |
| </script> |
| |
| </body> |
