third_party/WebKit/LayoutTests/media/controls/controls-video-keynav.html

<DOCTYPE html>
<title>Test media controls video keyboard navigation</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../media-file.js"></script>
<script src="../media-controls.js"></script>
<video controls></video>
<script>
test(_ => {
  assert_true('eventSender' in window);
}, 'eventSender required');

async_test(function(t) {
    var video = document.querySelector("video");
    video.src = findMediaFile("video", "../content/test");
    assert_equals(video.volume, 1);
    assert_equals(video.currentTime, 0);

    video.oncanplaythrough = t.step_func_done(function() {
      // Focus the video.
      video.focus();

      // 'Enter' plays the video.
      eventSender.keyDown("Enter");
      assert_false(video.paused);

      // 'Down' reduces volume.
      eventSender.keyDown("ArrowDown");
      assert_less_than(video.volume, 1);

      // 'Up' increases volume.
      eventSender.keyDown("ArrowUp");
      assert_equals(video.volume, 1);

      // 'Enter' again pauses the video.
      eventSender.keyDown("Enter");
      assert_true(video.paused);

      // 'Space' also pauses/plays the video.
      eventSender.keyDown(" ");
      assert_false(video.paused);

      eventSender.keyDown(" ");
      assert_true(video.paused);

      var cur = video.currentTime;

      // 'Right' scrubs the timeline forward.
      // Used to move the timeline off the first frame which is neccessary to
      // test 'Home', otherwise 'Home' is a no-op.
      eventSender.keyDown("ArrowRight");
      assert_greater_than(video.currentTime, cur);

      // 'Home' sets the timeline to 0.
      eventSender.keyDown("Home");
      assert_equals(video.currentTime, 0);

      // 'End' sets the timeline to end.
      eventSender.keyDown("End");
      assert_equals(video.currentTime, video.duration);

      // 'Left' scrubs the timeline back.
      eventSender.keyDown("ArrowLeft");
      assert_less_than(video.currentTime, video.duration);
    });
});
</script>