video-no-infinite-loop-playing-rvfc.html

<!DOCTYPE html>
<title>Test a single frame looping video generates rVFCs properly</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<video loop autoplay muted></video>
<script>
async_test(function(t) {
    var video = document.querySelector("video");
    var start = 0;
    var count = 0;
    var rvfc = 0;

    video.onseeking = t.step_func(_ => {
      video.requestVideoFrameCallback(_ => {
        ++rvfc;
      });
    });
    video.onseeked = t.step_func(_ => {
      if (++count == 3) {
            // Approximate since ordering is not guaranteed.
            assert_approx_equals(rvfc, count, 1);
            t.done();
      }
    });
    video.src = "resources/one_frame.webm";
});
</script>

chromium/third_party/blink/web_tests/media/video-no-infinite-loop-playing-rvfc.html