video-poster.html (1087B)
1 <!DOCTYPE HTML> 2 <meta charset=utf-8> 3 <title>Largest Contentful Paint: observe video poster image</title> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script src="resources/largest-contentful-paint-helpers.js"></script> 7 <script> 8 setup({"hide_test_state": true}); 9 async_test(function (t) { 10 assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); 11 const beforeLoad = performance.now(); 12 const observer = new PerformanceObserver( 13 t.step_func_done(function(entryList) { 14 assert_equals(entryList.getEntries().length, 1); 15 const entry = entryList.getEntries()[0]; 16 const url = window.location.origin + '/images/blue.png'; 17 // blue.png is 133 by 106. 18 const size = 133 * 106; 19 checkImage(entry, url, 'the_poster', size, beforeLoad); 20 }) 21 ); 22 observer.observe({type: 'largest-contentful-paint', buffered: true}); 23 }, "Able to observe a video's poster image."); 24 </script> 25 <video id='the_poster' src='/media/test.mp4' poster='/images/blue.png'></video>