| <!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 elementtiming='my_image' id='my_id' /> |
| <script> |
| setup({"hide_test_state": true}); |
| |
| const performanceEntryPromise = (pathname) => { |
| return new Promise(resolve => { |
| new PerformanceObserver((entryList, observer) => { |
| assert_equals(entryList.getEntries().length, 1); |
| if (entryList.getEntries()[0].url == pathname) { |
| observer.disconnect(); |
| resolve(entryList.getEntries()[0]); |
| } |
| }).observe({ type: 'element' }); |
| }); |
| } |
| |
| promise_test(async (t) => { |
| assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); |
| |
| // Take beforeRender timestamp. |
| const beforeRender1 = performance.now(); |
| |
| const img = document.getElementById('my_id'); |
| |
| const url1 = 'resources/square100.png'; |
| |
| const pathname1 = (new URL(url1, document.location)).href |
| |
| // Register performance observer. |
| const promise1 = performanceEntryPromise(pathname1); |
| |
| //Load image |
| await new Promise(resolve => { |
| img.addEventListener('load', resolve); |
| img.src = url1; |
| }); |
| |
| // Get element entry. |
| const entry1 = await promise1; |
| |
| // Check entry. |
| checkElement(entry1, pathname1, 'my_image', 'my_id', beforeRender1, img); |
| checkRect(entry1, [0, 100, 0, 100]); |
| checkNaturalSize(entry1, 100, 100); |
| |
| // Take beforeRender timestamp before changing image src. |
| const beforeRender2 = performance.now(); |
| |
| // Set the src to trigger another entry. |
| const url2 = '/images/black-rectangle.png'; |
| |
| const pathname2 = (new URL(url2, document.location)).href; |
| |
| const promise2 = performanceEntryPromise(pathname2); |
| |
| //Load image with changed src. |
| await new Promise(resolve => { |
| img.addEventListener('load', resolve); |
| img.src = url2; |
| }); |
| |
| // Get the corresponding element entry. |
| const entry2 = await promise2; |
| |
| // Check entry. |
| checkElement(entry2, pathname2, 'my_image', 'my_id', beforeRender2, img); |
| checkRect(entry2, [0, 100, 0, 50]); |
| checkNaturalSize(entry2, 100, 50); |
| }, 'Element Timing: changing src causes a new entry to be dispatched.') |
| </script> |
| |
| </body> |