| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Largest Contentful Paint: repeated image.</title> |
| <style> |
| #image_id { |
| width: 10px; |
| height: 10px; |
| } |
| </style> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/largest-contentful-paint-helpers.js"></script> |
| <script> |
| setup({"hide_test_state": true}); |
| async_test(function (t) { |
| assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); |
| let beforeLoad = performance.now(); |
| let firstCallback = true; |
| const url = window.location.origin + '/images/black-rectangle.png'; |
| const observer = new PerformanceObserver( |
| t.step_func(entryList => { |
| assert_equals(entryList.getEntries().length, 1); |
| const entry = entryList.getEntries()[0]; |
| |
| // First image is shrunk to be 10 x 10. The second image is added at its natural size: 100 x 50. |
| const size = firstCallback ? 10 * 10 : 100 * 50; |
| const id = firstCallback ? 'image_id' : 'second_id'; |
| checkImage(entry, url, id, size, beforeLoad); |
| if (firstCallback) { |
| const img = document.createElement('img'); |
| img.src = '/images/black-rectangle.png'; |
| img.id = 'second_id'; |
| beforeLoad = performance.now(); |
| document.getElementById('image_div').appendChild(img); |
| firstCallback = false; |
| return; |
| } else { |
| t.done(); |
| } |
| }) |
| ); |
| observer.observe({type: 'largest-contentful-paint', buffered: true}); |
| }, 'Repeated image produces different timestamps.'); |
| </script> |
| <img src='/images/black-rectangle.png' id='image_id'/> |
| <div id='image_div'></div> |
| </body> |