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http://lists.w3.org/Archives/Public/www-style/2011Apr/0351.html
Resolved by 1/4/2012 telcon to be treated as a syntax error. http://lists.w3.org/Archives/Public/www-style/2012Jan/0099.html
What is thrown out by this error is unclear: 1. The declaration it applies to? 2. The keyframe rule it belongs to? 3. The entire @keyframes rule?
fantasai: RESOLVED: drop declaration, not @keyframes, for bug 14792
Fixed in Editor's Draft.