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It's hardly "built entirely with valid HTML5 and CSS3" if they're using proprietary -webkit- properties rather than CSS3 properties.

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sice CSS3 is still a work in progress browsers implement upcomig features using -webkit/-o/-moz there's nothing wrong with it (as long than you don't use the non-valid ie's filter crap)

If you take a look here: http://www.w3.org/Style/CSS/current-work you can clearly see that pretty much everything is in Working Draft state so isn't really stable

It may be valid according to the wording, but denying supported features to all but one rendering engine is certainly not compatible with the spirit of any web standard.

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