Toggle HTML5 video tag fullsceen with enter key

index.html

<video id="Video1" width="1134" height="906" controls>
  <source src="test_1.mp4" type="video/mp4">
  Your browser does not support the video tag.
</video>

<script>

document.addEventListener("keypress", function(e) {
  e = e || window.event;
  if(e.keyCode == 13) {
      toggleFullScreen();
  }
}

function toggleFullScreen() {
    var elem = document.getElementById(videoId);

  if (!document.fullscreenElement &&    // alternative standard method
      !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement ) {  // current working methods
        if (elem.requestFullscreen) {
          elem.requestFullscreen();
        } else if (elem.msRequestFullscreen) {
          elem.documentElement.msRequestFullscreen();
        } else if (elem.mozRequestFullScreen) {
          elem.mozRequestFullScreen();
        } else if (elem.webkitRequestFullscreen) {
          elem.webkitRequestFullscreen();
        }
    } else {
        if (elem.exitFullscreen) {
          elem.exitFullscreen();
        } else if (elem.msExitFullscreen) {
          elem.msExitFullscreen();
        } else if (elem.mozCancelFullScreen) {
          elem.mozCancelFullScreen();
        } else if (elem.webkitExitFullscreen) {
          elem.webkitExitFullscreen();
        }
    }
}

</script>