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http://lists.w3.org/Archives/Public/public-fx/2011OctDec/0077.html
I added a media feature 'filter' to the specification. Custom filters (like CSS Shaders) can extend the value with own keywords. I thought about 'webgl' for CSS shaders. https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#media-feature-filter