| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Largest Contentful Paint: src change triggers new entry.</title> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/largest-contentful-paint-helpers.js"></script> |
| <img src='/images/green-1x1.png' id='image_id' width="133" height="106"/> |
| <script> |
| async_test(function (t) { |
| assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); |
| let beforeLoad = performance.now(); |
| document.getElementById('image_id').src = '/images/blue.png'; |
| const url = window.location.origin + '/images/blue.png'; |
| const observer = new PerformanceObserver( |
| t.step_func(function(entryList) { |
| let entries = entryList.getEntries().filter(e => e.url === url); |
| if (entries.length === 0) |
| return; |
| assert_equals(entries.length, 1); |
| const entry = entries[0]; |
| // blue.png is 133 by 106. |
| const size = 133 * 106; |
| checkImage(entry, url, 'image_id', size, beforeLoad); |
| t.done(); |
| }) |
| ); |
| observer.observe({type: 'largest-contentful-paint', buffered: true}); |
| }, 'Largest Contentful Paint: changing src causes a new entry to be dispatched.'); |
| </script> |
| </body> |
