I'm currently implementing Pointer Lock [1] in WebKit, which was adjusted recently to mimic Fullscreen [2].
Why does the Fullscreen specification use an iframe attribute allowfullscreen to permit/restrict iframe capabilities instead of using iframe sandbox="allow-fullscreen"? [1] http://dvcs.w3.org/hg/pointerlock/raw-file/default/index.html [2] http://dvcs.w3.org/hg/fullscreen/raw-file/tip/Overview.html