gameQuery, a new jQuery plugin, provides functions for creating browser games. In this early stage gameQuery supports a main-loop, game area (playground), sprites with CSS animations and sounds (not tried yet).
The current gameQuery version is 0.2.5 and so there are some points for improvement. Every sprite needs an animation and every animation needs an image even if you don't need it. Playground is always position:absolute and it has a black border. Only little things that you can override.