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http://lists.w3.org/Archives/Public/www-style/2011Sep/0435.html
Updated the grammar definition to keyframes-rule: KEYFRAMES_SYM S* IDENT '{' keyframes-blocks '}' S*; keyframes-blocks: [ S* keyframe-selector '{' S* declaration? [ ';' S* declaration? ]* '}' ]* ; keyframe-selector: [ FROM_SYM | TO_SYM | PERCENTAGE ] [ ',' [ FROM_SYM | TO_SYM | PERCENTAGE ] ]*; @{K}{E}{Y}{F}{R}{A}{M}{E}{S} {return KEYFRAMES_SYM;} {F}{R}{O}{M} {return FROM_SYM;} {T}{O} {return TO_SYM;}