doubletap-to-toggle-fullscreen.html

<!DOCTYPE html>
<html>
<title>Test that player will enter fullscreen if double tapped.</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../media-controls.js"></script>
<video controls width=400 src="../content/60_sec_video.webm"></video>
<script>
async_test(t => {
  const video = document.querySelector('video');

  video.addEventListener('playing', () => {
    // Double tap on the left side.
    const coordinates = videoLeftEdgeCoordinates(video);
    doubleTapAtCoordinates(coordinates[0], coordinates[1]);
  }, { once: true });

  video.addEventListener('fullscreenchange', t.step_func(() => {
    assert_equals(video, document.fullscreenElement);

    // We are now fullscreen, update the event handler and doubletap to exit
    video.addEventListener('fullscreenchange',
        t.step_func_done(), { once: true });

    const coordinates = videoLeftEdgeCoordinates(video);
    doubleTapAtCoordinates(coordinates[0], coordinates[1]);
  }), { once: true });

  video.play();
});
</script>
</html>

chromium/third_party/blink/web_tests/media/controls/doubletap-to-toggle-fullscreen.html