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

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