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http://lists.w3.org/Archives/Public/www-style/2011Apr/0357.html
WebKit ignores keyframes > 100%, but negative keyframe values cause the animation to be ignored.
Simon, are you sure about that? I see WebKit (latest Chrome) ignore the entire animation rule if one of the keyframe selectors is <0% or >100%. Firefox and IE only ignore these keyframe selectors and otherwise run the animation as if they weren't there.
Fixed, following http://lists.w3.org/Archives/Public/www-style/2012Aug/0125.html
Bug for webkit: https://bugs.webkit.org/show_bug.cgi?id=93414