Browser: Mozilla Firefox 16.0.2 (64 bit)
Result: Rendered, but laggy.
Browser: Google Chrome 23.0.1271.64
Result: "Either your graphics card or your browser does not support WebGL. Please try again on a Windows, Mac, or Linux computer using Google Chrome
or another WebGL-Compatible browser. You can watch a video preview of the experiment below:"
I am using the open source ATI drivers because AMD excluded my card from the latest version of the ATI drivers that actually works with the new version of X that's found in newer distributions, but it does seem to run the 3-D games I play and everything just fine so I don't see why it would have an issue like this.