| Nicolás Peña Moreno | d9e65dc | 2019-08-15 14:29:55 | [diff] [blame] | 1 | <!DOCTYPE HTML> |
| 2 | <meta charset=utf-8> |
| 3 | <title>Largest Contentful Paint: observe element with background image in its first letter</title> |
| 4 | <body> |
| 5 | <style> |
| 6 | #target::first-letter { |
| 7 | background-image: url('/images/black-rectangle.png'); |
| 8 | } |
| 9 | </style> |
| 10 | <script src="/resources/testharness.js"></script> |
| 11 | <script src="/resources/testharnessreport.js"></script> |
| Nicolás Peña Moreno | 4ad4e60 | 2019-08-29 18:55:14 | [diff] [blame^] | 12 | <script src="resources/largest-contentful-paint-helpers.js"></script> |
| Nicolás Peña Moreno | d9e65dc | 2019-08-15 14:29:55 | [diff] [blame] | 13 | <script> |
| Nicolás Peña Moreno | d9e65dc | 2019-08-15 14:29:55 | [diff] [blame] | 14 | async_test(function (t) { |
| 15 | if (!window.LargestContentfulPaint) { |
| 16 | assert_unreached("LargestContentfulPaint is not implemented"); |
| 17 | } |
| Nicolás Peña Moreno | 4ad4e60 | 2019-08-29 18:55:14 | [diff] [blame^] | 18 | const beforeLoad = performance.now(); |
| Nicolás Peña Moreno | d9e65dc | 2019-08-15 14:29:55 | [diff] [blame] | 19 | const observer = new PerformanceObserver( |
| 20 | t.step_func(function(entryList) { |
| 21 | entryList.getEntries().forEach(entry => { |
| 22 | // If we happen to get a text entry due to text happening before the image, return. |
| 23 | if (entry.url === '') |
| 24 | return; |
| Nicolás Peña Moreno | 4ad4e60 | 2019-08-29 18:55:14 | [diff] [blame^] | 25 | const url = window.location.origin + '/images/black-rectangle.png'; |
| 26 | checkImage(entry, url, 'target', 0, beforeLoad, ['sizeLowerBound']); |
| Nicolás Peña Moreno | d9e65dc | 2019-08-15 14:29:55 | [diff] [blame] | 27 | t.done(); |
| 28 | }) |
| 29 | })); |
| 30 | observer.observe({entryTypes: ['largest-contentful-paint']}); |
| 31 | }, 'Largest Contentful Paint: first-letter is observable.'); |
| 32 | </script> |
| 33 | <div id='target'>A</div> |
| 34 | </body> |
