The power in WebGl

I recently stumbled upon a pretty amazing demo showing just what can be done with javascript and Webgl.  You can check it out at https://developer.mozilla.org/en-US/demos/detail/bananabread . Basically they took a full game engine written in C++ and OpenGL and ported it to javascript and webgl.  It's open source, so I will be able to study it out and get a good idea of where I could go to start my own game later on.