[whatwg] "fullscreenchange" event should be delayed to after transition is complete
Chris Pearce
cpearce at mozilla.com
Tue May 15 17:33:15 PDT 2012
Hi,
I think that the "fullscreenchange" even dispatch should be specified to
be dispatched once the animation to transition to/from fullscreen has
finished.
The problem is that at least two of the platforms we're supporting have
non-instantaneous transitions from windowed to fullscreen mode. So if we
dispatch "fullscreenchange" events as specified during
HTMLElement.requestFullscreen() then the "fullscreenchange" events can
arrive before the transition animation has finished, so things like
window.screenY and window.size.* haven't reached their stable fullscreen
values.
Our unit tests have been randomly failing because of this, so I'm sure
this will cause problems with authors in the wild.
I think having the state changes performed by
HTMLElement.requestFullscreen() happen synchronously before the
animation/transition to enter fullscreen completes (as specified
currently) and having them undone before the animation to exit
fullscreen completes (also as specified currently in exitFullscreen())
is probably OK, since these state changes maybe required for the
transition/animation. It's only the dispatch of "fullscreenchange" I
think we should change.
Cheers,
Chris Pearce.
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