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Consider moving http://dev.w3.org/csswg/css-conditional/#the-cssgroupingrule-interface to CSSOM
https://dvcs.w3.org/hg/csswg/rev/541eba76dfd7
Please remove CSSGroupingRule from CSS Conditional Rules Module
Hmmm. I think css3-conditional is probably substantially more stable than cssom, so I'm not so convinced.