[1] CSS Conditional Rules Module Level 3 ( (2012-09-11 09:24:30 +09:00 版)) <http://www.w3.org/TR/2012/WD-css3-conditional-20120911/>

[2] Conditional Group Rules draft (better name needed) ( (L. David Baron 著, 2011-06-04 15:14:21 +09:00 版)) <http://lists.w3.org/Archives/Public/www-archive/2011Jun/0002.html>

[3] per-site user stylesheet rules ( (L. David Baron 著, 2004-08-20 06:06:54 +09:00 版)) <http://lists.w3.org/Archives/Public/www-style/2004Aug/0135>

[4] CSS Conditional Rules Module Level 3 ( (2013-08-09 23:50:23 +09:00 版)) <http://dev.w3.org/csswg/css-conditional/>