[1] CSS Regions Module Level 3 ( (4/29/2012, 8:05:51 PM 版)) <http://www.w3.org/TR/2012/WD-css3-regions-20120503/>
[2] CSS Regions Module Level 1 ( (5/27/2013, 9:14:15 PM 版)) <http://www.w3.org/TR/2013/WD-css3-regions-20130528/>
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