I like your code.
In Chrome i tried to exit from full screen by press ESC button. And worked perfectly.
Do you have any idea why?
sory about my english
There might have been a change in YouTube's or Chrome's behavior. It's been two years since I tested :D
I'm glad it works now
Update update update! (seems to work pretty well now) . : )
Need to know how to enable it? Go here.