What JavaScript can do in browser for game programming

This is what javascript can do in browser for game programming now:

http://www.babylonjs.com/

This is from Microsoft developer, and features engine for many 3D effects that used to be available on desktop applications only. Note you will need a browser that supports WebGL, such as Chome.

WebGL [1][2] makes use of GPU (Graphics Processing Unit) to render 2D and 3D graphics in browser.

References:
[1] Wiki: WebGL
[2] Compatibility table for support of WebGL in desktop and mobile browsers