I'm getting this message in the console.
requestFullscreen() is deprecated on insecure origins, and support will be removed in the future. You should consider switching your application to a secure origin, such as HTTPS. See https://goo.gl/rStTGz for more details.
I think that removing full screen functionality for regular http is not a good idea. So will videos, games, and all casual full screen web applications require https too?
I know that F11(Windows) or Cmd + F(Mac) will bring the app to the full screen anyway but now WebVR is coming, games in WebGL and other immersive experiences so don't you think that this will be a step back?