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Specs that introduce new @ rules should define a corresponding subtype of CSSRule [1] in order to provide equivalent CSSOM support. In addition, a rule type constant should be defined and added to [2]. [1] http://dvcs.w3.org/hg/csswg/raw-file/tip/cssom/Overview.html#the-cssrule-interface [2] http://wiki.csswg.org/spec/cssom-constants
http://dvcs.w3.org/hg/webcomponents/rev/b59bf10603d4