WebGL is not supported on this device :(
:( What browser are you using? Are you on your phone?
Firefox on a Mac.
It worked for me on Firefox on W7 x64
Uhh... sadly I'm not very familiar with either of those platforms, maybe try typing "about:config" (no quotes) in the URL, searching for "webgl" and enabling it for all websites.
Works on chrome.
Uh, I had canvas support turned off on firefox to stop fingerprinting.