Vendor prefixes
Animating the expansion
Height animated via max-height
Solved DOM not updating in time bug + options

Also added options to the animation
Cleanup
Trying to move to height from max-height
Debugging
Revert "Debugging"

This reverts commit 1329bc43f498199bf132842cc72a43228ce4553c.
More timeouts to let the DOM update...

Come on DOM
Tidying
Add lostFocusCallback
Test the fullscreen options
Add a "lost focus" callback
Test lost focus callback