[1] CSS Font Loading Module Level 3 ( (2014-02-19 22:12:23 +09:00 版)) <http://www.w3.org/TR/2014/WD-css-font-loading-3-20140220/>

[3] CSS Font Loading Module Level 3 ( (2014-05-22 22:58:35 +09:00 版)) <http://www.w3.org/TR/2014/WD-css-font-loading-3-20140522/>

[2] CSS Font Loading Module Level 3 ( (2014-07-07 22:50:03 +09:00 版)) <http://dev.w3.org/csswg/css-font-loading/>