[1] Web Controls 1.0 (2004-11-09 08:49:52 +09:00 版) <http://www.whatwg.org/specs/web-controls/current-work/#focus>

[2] CSS3 module: Basic User Interface ( (Tantek Çelik 著, 2002-08-03 07:13:43 +09:00 版)) <http://www.w3.org/TR/2002/WD-css3-ui-20020802/#nav-index>

[3] CSS3 Basic User Interface Module ( (Tantek Çelik 著, 2003-07-04 02:51:33 +09:00 版)) <http://www.w3.org/TR/2003/WD-css3-ui-20030703/#nav-index>

[4] CSS3 Basic User Interface Module ( (Tantek Çelik 著, 2004-05-12 02:17:47 +09:00 版)) <http://www.w3.org/TR/2004/CR-css3-ui-20040511/#nav-index>

[5] CSS Basic User Interface Module Level 3 (CSS3 UI) ( (Tantek Çelik 著, 2011-09-29 17:32:08 +09:00 版)) <http://dev.w3.org/csswg/css3-ui/#nav-index>

[6] Web Controls 1.0 ( (2004-11-09 08:49:52 +09:00 版)) <http://www.whatwg.org/specs/web-controls/current-work/#focus>

[7] Web Applications Markup Language 1.0 ( (2004-04-08 02:39:12 +09:00 版)) <http://hixie.ch/specs/html/apps/web-apps-1#focus>

[8] CSS Basic User Interface Module Level 3 (CSS3 UI) ( (Tantek Çelik 著, 2012-01-13 20:03:30 +09:00 版)) <http://www.w3.org/TR/2012/WD-css3-ui-20120117/#nav-index>

[9] XML Binding Language (XBL) 2.0 ( (2007-03-16 22:20:16 +09:00 版)) <http://www.w3.org/TR/2007/CR-xbl-20070316/#the-focus>

[10] IRC logs: freenode / #whatwg / 20140225 ( (2014-02-27 00:09:37 +09:00 版)) <http://krijnhoetmer.nl/irc-logs/whatwg/20140225>

[11] csswg: changeset 14966:d176479b88ff ( (2014-12-25 13:48:50 +09:00 版)) <https://dvcs.w3.org/hg/csswg/rev/d176479b88ffe2dcfa027be6aee807afc0d45bd2>

[12] nav-index may move to CSS4 UI ( (Chris Lilley 著, 2014-11-19 20:03:41 +09:00 版)) <http://lists.w3.org/Archives/Public/public-svg-wg/2014OctDec/0063.html>