[1] [CITE[IRC logs: freenode / #whatwg / 20121108]]
( ([TIME[2012-11-25 23:14:53 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20121108>

[2] [CITE@en-US[csswg: changeset 8744:efa135e27361]]
( ([TIME[2013-07-27 10:31:02 +09:00]] 版))
<https://dvcs.w3.org/hg/csswg/rev/efa135e27361>

[3] [CITE@en[CSS Syntax Module Level 3]]
( ([TIME[2013-07-26 07:52:42 +09:00]] 版))
<http://dev.w3.org/csswg/css-syntax/#the-charset-rule>