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It bugs me that this is labeled "in CSS3". The only CSS3 here is some gradients and transitions. It uses plenty of images and Javascript.

Agreed. Stick with HTML5, people. It's almost always never just "HTML5" so we know what to expect. Labeling this as CSS3 is much more misleading.

A bit of CSS3 and three JS libraries: http://i.imgur.com/aQDg1.png