[1] [CITE@en[CSS3 Generated and Replaced Content Module]]
( ([TIME[2003-05-15 21:54:58 +09:00]] 版))
<http://www.w3.org/TR/2003/WD-css3-content-20030514/#counters>

[2] [CITE@en[CSS Generated Content Module Level 3]]
( ([TIME[2011-04-21 02:28:30 +09:00]] 版))
<http://dev.w3.org/csswg/css3-content/#counters>

[3] [CITE@en[CSS Generated Content Module Level 3]]
( ([TIME[2011-04-21 02:28:30 +09:00]] 版))
<http://dev.w3.org/csswg/css3-content/#counters>