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Animations and transitions need a warning about WCAG SC 2.3.1 http://www.w3.org/TR/WCAG20/#seizure-does-not-violate not to cause seizures with animation.
This was resolved in http://lists.w3.org/Archives/Public/www-style/2011Nov/0712.html and led to https://www.w3.org/Style/CSS/Tracker/actions/399
Fixed in https://dvcs.w3.org/hg/csswg/rev/5df9b029337c