| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: observe video poster image</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <script> |
| let beforeRender; |
| async_test(function (t) { |
| if (!window.PerformanceElementTiming) { |
| assert_unreached("PerformanceElementTiming is not implemented"); |
| } |
| const observer = new PerformanceObserver( |
| t.step_func_done(function(entryList) { |
| assert_equals(entryList.getEntries().length, 1); |
| const entry = entryList.getEntries()[0]; |
| const index = window.location.href.lastIndexOf('/'); |
| const pathname = window.location.href.substring(0, index) + |
| '/resources/circle.svg'; |
| checkElement(entry, pathname, 'my_poster', 'the_poster', beforeRender, |
| document.getElementById('the_poster')); |
| // Assume viewport has size at least 200, so the element is fully visible. |
| checkRect(entry, [0, 200, 0, 200]); |
| checkNaturalSize(entry, 200, 200); |
| }) |
| ); |
| observer.observe({entryTypes: ['element']}); |
| beforeRender = performance.now(); |
| }, "Able to observe a video's poster image."); |
| </script> |
| <style> |
| body { |
| margin: 0; |
| } |
| </style> |
| <video elementtiming='my_poster' id='the_poster' src='/media/test.mp4' poster='resources/circle.svg'/> |