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http://lists.w3.org/Archives/Public/www-style/2011Nov/0542.html
Correcting link http://lists.w3.org/Archives/Public/www-style/2011Dec/0144.html
Reopening; we are not sure whether an animation runs because it has a non-zero duration or because at least one keyframe rule in the animation animates one animatable property.
Fixed in 1/11/13 draft.