testing/web-platform/tests/paint-timing/fcp-only/fcp-video-frame.html

   1 <!DOCTYPE html>
   2 <head>
   3 <title>Performance Paint Timing Test: FCP due to loaded video frame</title>
   4 </head>
   5 <body>
   6 <script src="../resources/utils.js"></script>
   7 <script src="/resources/testharness.js"></script>
   8 <script src="/resources/testharnessreport.js"></script>
   9 <script src="/common/media.js"></script>
  10 <video id="video" autoplay></video>
  11 <script>
  12   promise_test(async t => {
  13       assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
  14       await new Promise(r => window.addEventListener('load', r));
  15       await assertNoFirstContentfulPaint(t);
  16       // Set actual video content to trigger FCP.
  17       const video = document.getElementById('video');
  18       video.src = getVideoURI('/media/test');
  19       await new Promise(resolve => {
  20         video.oncanplay = resolve;
  21       });
  22       await assertFirstContentfulPaint(t);
  23   }, 'Video should become contentful when first frame is loaded');
  24 </script>
  25 </body>
  26 </html>