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Same here, nothing happened. Firefox 20, Chromium 26.0.1410.43 (189671) and Opera 12.15 (build 1748). All on Linux.

Yes, its' not working in Chrome for linux ( 27.0.1453.12 dev), check it in Windows

In Chrome, go to about:gpu, and look for the line: WebGL: Hardware accelerated

If you don't see that, then WebGL isn't enabled for you, probably due to a blacklisted card/driver. That's the most likely cause.

Not sure if this applies to you but I had to refresh the page before I realized the first slide is just blank and images appear on successive slides.