JavaScript Pointer Lock (Mouse Lock) in Chrome Developer Preview
Makers of online FPS’s rejoice! Mouse Lock has popped up in the Chrome Developer Preview (so far Fullscreen only mode, but it will be available in Windowed mode in the long run) and could make it into Chrome around version 19. If you want to give it a shot, follow these instructions to get a preview build installed and the option turned on.
[via HTML5GameDevs.com]