歴史

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

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

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

[4] Bug 28966 – [HTML5][Forms] <input type=color> simple implementation (2009-12-27 18:51:30 +09:00 版) https://bugs.webkit.org/show_bug.cgi?id=28966

[5] Opera: Opera 11.00 for Windows changelog ( (Frank M. Palinkas, Technical Writer, Opera Software ASA 著, 2011-04-24 11:17:12 +09:00 版)) http://www.opera.com/docs/changelogs/windows/1100/

[6] [whatwg] restricted palette for input type=color ( (2012-05-30 07:40:02 +09:00 版)) http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035645.html

[7] [whatwg] Allow empty string for input type=color (2012-06-14 09:13:58 +09:00 版) http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2012-June/036392.html

[8] input@type=color mappings / issue #48 (jasonkiss著, 2018-01-08 16:56:58 +09:00) https://github.com/w3c/html-aam/commit/fd1e1c20d243fdfbf572b649fe0a99e72fdde1be

[9] HTML-AAM: determine right mappings for popup ui for input type=color · Issue #48 · w3c/html-aam (2018-01-09 11:11:59 +09:00) https://github.com/w3c/html-aam/issues/48

[10] Safari 12.1 Release Notes | Apple Developer Documentation (2019-02-10 12:07:45 +09:00) https://developer.apple.com/documentation/safari_release_notes/safari_12_1_release_notes