How do I Preview Fullscreen on Mobile?

I've been reading through posts and tutorials for a couple days and can't seem to find out how to preview my game in fullscreen on my mobile. Do i have to export it to cocoon or something of that nature?

i've tried using scale inner and browser object -> request fullscreen in both chrome and firefox but i still get the address bar.

Thanks for any help

Make sure the browser request is done on a user-initiated action, like pressing a button.