[1] [CITE@ja[2009年5月 - Blog - EOF]] ([[Taku Watabe]] 著, [TIME[2009-05-16 00:11:32 +09:00]] 版) <http://end-of-file.net/blog/2009-05.html#date-2009-05-16>

>IE8 と Opera 9.5 以降で :active 疑似クラスは親要素に伝搬しない



[2] [CITE[IRC logs: freenode / #whatwg / 20101228]]
( ([TIME[2011-01-07 01:10:29 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20101228#l-440>

[3] [CITE@en[Web Applications 1.0 r5881     Define that :active works between mousedown and mouseup.]]
( ([TIME[2011-02-12 09:33:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=5880&to=5881>