[whatwg] Fullscreenchange event

[Chris Pearce]

Should we still dispatch the fullscreenchange event to the element which 
requested fullscreen if the element was removed from its document before 
the event was dispatched? What if the element was added to another 
document before the event could be dispatched? Should we dispatch to 
requester's original document in these cases? Or just not dispatch the 
event? We'll be exiting full-screen in this case anyway, since the 
element was removed from the doc. Or should we do something else?

Regards,
Chris Pearce.