[1] [CITE[<input type=color>]] ([[Ian Hickson <ian@...>]] 著, [TIME[2008-11-26 03:48:07 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/16824>

[2] [CITE['''['''whatwg''']''' Adding alpha channel to <input type=color>]]
([TIME[2009-09-04 18:09:44 +09:00]] 版)
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2009-September/022538.html>

[3] [CITE[IRC logs: freenode / #whatwg / 20090826]]
([TIME[2009-10-15 22:55:13 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20090826>