[1]
[CITE[Bug 221981 - implement content pseudo-class :contains()]] <https://bugzilla.mozilla.org/show_bug.cgi?id=221981>

[2]
[[manakai]] は [CODE(CSS)@en[:[[contains]]()]] と同じ意味の
[CODE(CSS)@en[:[[-manakai-contains]]()]] を実装しています。

[3] [CITE[IRC logs: freenode / #whatwg / 20110731]]
( ([TIME[2011-08-12 00:32:40 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20110731>

[4] [CITE@en[Selectors Level 3]] ([TIME[2011-09-29 22:16:17 +09:00]] 版) <http://www.w3.org/TR/selectors/#content-selectors>