How to make Ruffle Go Fullscreen

Question

I have a website that has a lot of games including Flash. Im using Ruffle Emulator to emulate those games. I have a fullscreen button thats supposed to go in Fullscreen but its not.

I have tried to use this code but it does not work

  // Get the Ruffle player element 
  const ruffle = window.RufflePlayer.newest();

  if (ruffle.fullscreenEnabled) {
    ruffle.enterFullscreen();
    alert("Press ESC to exit fullscreen.");
  } else {
    alert("Fullscreen is not supported.");
  }

If you could help me I would appreaciate it!

Thanks in advance!