[1] [CITE@en[CSS Regions Module Level 3]]
( ([TIME[2012-04-30 05:05:51 +09:00]] 版))
<http://www.w3.org/TR/2012/WD-css3-regions-20120503/>

[2] [CITE@en[CSS Regions Module Level 1]]
( ([TIME[2013-05-28 06:14:15 +09:00]] 版))
<http://www.w3.org/TR/2013/WD-css3-regions-20130528/>