[1]
[CITE[Latest topics > XULのstackとCSSのopacityで嵌った - outsider reflex]] ([[Piro(SHIMODA Hiroshi)]] 著, [CODE[2007-10-19 22:01:47 +09:00]] 版) <http://piro.sakura.ne.jp/latest/blosxom/mozilla/xul/2007-10-12_stack-opacity-toolbarbutton.htm>

[2] [CITE[IRC logs: freenode / #whatwg / 20131025]]
( ([TIME[2013-10-27 00:30:33 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20131025#l-693>