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http://lists.w3.org/Archives/Public/www-style/2011Jun/0650.html
http://lists.w3.org/Archives/Public/www-style/2011Aug/0072.html says the group resolved to use premultiplied colors for gradients and transitions
*** Bug 15843 has been marked as a duplicate of this bug. ***
https://dvcs.w3.org/hg/csswg/rev/be188be3a708