| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Largest Contentful Paint: expanded image bounded by intrinsic size.</title> |
| <style type="text/css"> |
| #image_id { |
| width: 300px; |
| height: 300px; |
| } |
| </style> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| async_test(function (t) { |
| if (!window.LargestContentfulPaint) { |
| assert_unreached("LargestContentfulPaint is not implemented"); |
| } |
| let beforeRender = performance.now(); |
| const observer = new PerformanceObserver( |
| t.step_func_done(function(entryList) { |
| assert_equals(entryList.getEntries().length, 1); |
| const entry = entryList.getEntries()[0]; |
| assert_equals(entry.entryType, 'largest-contentful-paint'); |
| assert_greater_than_equal(entry.renderTime, beforeRender, |
| 'The rendering timestamp should occur after script starts running.'); |
| assert_greater_than_equal(performance.now(), entry.renderTime, |
| 'The rendering timestamp should occur before the entry is dispatched to the observer.'); |
| assert_equals(entry.startTime, entry.renderTime, 'startTime should equal renderTime'); |
| assert_equals(entry.duration, 0); |
| // black-rectangle.png is 100 x 50. It occupies 300 x 300 so size will be bounded by the intrinsic size. |
| assert_equals(entry.size, 5000); |
| assert_equals(entry.id, 'image_id'); |
| const pathname = window.location.origin + '/images/black-rectangle.png'; |
| assert_equals(entry.url, pathname); |
| assert_equals(entry.element, document.getElementById('image_id')); |
| }) |
| ); |
| observer.observe({type: 'largest-contentful-paint', buffered: true}); |
| }, 'Largest Contentful Paint: |size| attribute is bounded by intrinsic size.'); |
| </script> |
| <img src='/images/black-rectangle.png' id='image_id'/> |
| </body> |
