HTML5 can do WHAT?!
I'm not a coder, and on this subject am essentially 100% a user, but - HTML5 can force a browser into full-screen mode? What kind of cretin ever thought THAT was a good idea?! I'm apalled!
As a user, my attitude is 'my browser, it goes full-screen only if and when I tell it to - which is never, in my case. This may explain a couple of times I've found myself having to reboot due to what seemed to me to be a browser fault. I'd presumed I'd somehow accidentally sent the browser full-screen (everything's so bloody twitchy in feel these days, with umpty-zillion ways of invoking this or that feature you didn't even know existed, much less care about) so a quick F11 - nada. Couldn't get out of fullscreen, couldnt get at my desktop, three-fingered salute didnt work, only option was to power off and reboot. And this on a Linux box.
Gah. No, I'm not interested in the arguments put foward for websites being enabled to force fullscreen - it's a shitheaded decision, and there's an end to it. It's this kind of fuckwittery that has made what was once an interesting and exciting subject - IT - into a boody awful and tedious consumer of precious hours of my life NOT doing fun things that I won't ever get back on all too many occasions.