[1] CSS Flexible Box Layout Module Level 1 ( (2014-03-25 03:38:28 +09:00 版)) <http://www.w3.org/TR/2014/WD-css-flexbox-1-20140325/>

[2] CSS Flexible Box Layout Module Level 1 ( (2014-09-25 17:23:23 +09:00 版)) <http://www.w3.org/TR/2014/WD-css-flexbox-1-20140925/>

[3] CSS Flexible Box Layout Module Level 1 ( (2015-05-14 02:17:25 +09:00 版)) <http://www.w3.org/TR/2015/WD-css-flexbox-1-20150514/>

[4] CSS Flexible Box Layout Module Level 1 (2016-02-29 16:35:20 +09:00 版) <https://www.w3.org/TR/2016/CR-css-flexbox-1-20160301/>

[5] New CR for CSS Flexible Box Layout Module Level 1 (Thierry MICHEL著, 2017-10-19 21:08:23 +09:00) <https://lists.w3.org/Archives/Public/www-style/2017Oct/0040.html>

[6] CSS Flexible Box Layout Module Level 1 (2017-10-19 15:55:50 +09:00) <https://www.w3.org/TR/2017/CR-css-flexbox-1-20171019/>