42. CSS3 の仕様書
CSS current work & how to participate
http://www.w3.org/Style/CSS/current-work
Selectors
http://www.w3.org/TR/css3-selectors/
CSS Color Module
http://www.w3.org/TR/2011/REC-css3-
color-20110607/
Media Queries
http://www.w3.org/TR/2010/CR-css3-
mediaqueries-20100727/
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