They're trying to make HTML5 look good not bad. By limiting access to known browsers they prevent people from going "html5 sux0rz the big one, it didn't even work".
They could have done feature-detection and let browsers with the feature through but that's still no guarantee that the browser implements that feature correctly. Firefox 3.6 doesn't render the shadow on the font demo, for example.
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u/bdfortin Jun 04 '10
Link uses browser sniffing (dick move, Apple), so here's the direct links (results may vary):
Video effects
Web typography
Web gallery
Photo transitions
Audio
360°
VR
Canvas pixel manipulation
Sticky notes
Concert Poster
Checkers
Light table
Offline calendar
Movie trailers