| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: src change triggers new entry</title> |
| <body> |
| <style> |
| body { |
| margin: 0; |
| } |
| </style> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <img src='resources/square100.png' elementtiming='my_image' id='my_id'/> |
| <script> |
| async_test(function (t) { |
| assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); |
| let beforeRender = performance.now(); |
| const img = document.getElementById('my_id'); |
| let firstCallback = true; |
| const observer = new PerformanceObserver( |
| t.step_func(entryList => { |
| assert_equals(entryList.getEntries().length, 1); |
| const entry = entryList.getEntries()[0]; |
| if (firstCallback) { |
| const pathname = window.location.origin + '/element-timing/resources/square100.png'; |
| checkElement(entry, pathname, 'my_image', 'my_id', beforeRender, img); |
| checkRect(entry, [0, 100, 0, 100]); |
| checkNaturalSize(entry, 100, 100); |
| |
| // Set the src to trigger another entry. |
| img.src = '/images/black-rectangle.png'; |
| beforeRender = performance.now(); |
| firstCallback = false; |
| return; |
| } |
| const pathname = window.location.origin + '/images/black-rectangle.png'; |
| checkElement(entry, pathname, 'my_image', 'my_id', beforeRender, img); |
| checkRect(entry, [0, 100, 0, 50]); |
| checkNaturalSize(entry, 100, 50); |
| t.done(); |
| })); |
| observer.observe({type: 'element', buffered: true}); |
| }, 'Element Timing: changing src causes a new entry to be dispatched.'); |
| </script> |
| |
| </body> |
