[4]
[CITE@en[CSS::default - MDC]] ([CODE[2007-09-01 17:35:18 +09:00]] 版) <http://developer.mozilla.org/en/docs/CSS::default>
([[名無しさん]])

[5]
[CITE[Bug 302186 &#8211; Support :default pseudoclass]] ([TIME[2008-09-16 07:42:32 +09:00]] 版) <https://bugzilla.mozilla.org/show_bug.cgi?id=302186>
([[名無しさん]])



[6] [CITE@en-GB-x-Hixie[Web Forms 2.0]]
([TIME[2009-01-05 20:07:15 +09:00]] 版)
<http://www.whatwg.org/specs/web-forms/current-work/#relation>

[7] [CITE@en[HTML5 Revision Tracker]]
([TIME[2010-08-03 23:55:33 +09:00]] 版)
<http://html5.org/tools/web-apps-tracker?from=5228&to=5229>

[8] [CITE['''['''whatwg''']''' Should :default apply to checkboxes, radios, and options?]]
([TIME[2010-08-03 23:56:56 +09:00]] 版)
<http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2010-August/027528.html>