22.09.2011, Χ 14:25, Darin Fisher ΞΑΠΙΣΑΜ(Α):
Our next step is to extend this to non-fullscreen, so I think it would be counter-productive to preclude non-fullscreen at this time.
I think that adding an API for non-fullscreen mouse lock would be a detriment to the Web platform. So gating fullscreen API on it seems pretty controversial.