[1] IRC logs: freenode / #whatwg / 20081207 (2008-12-10 07:23:14 +09:00 版) http://krijnhoetmer.nl/irc-logs/whatwg/20081207#l-206

文脈メニューが表示されるタイミングが環境によって異なるので (Mac では mousedown、 Windows では mouseup)、 contextmenu が発火されるタイミングも環境依存。

[2] HTML5 context menus in Firefox (Screencast and Code) ✩ Mozilla Hacks – the Web developer blog (2015-07-14 21:26:44 +09:00 版) https://hacks.mozilla.org/2011/11/html5-context-menus-in-firefox-screencast-and-code/

[3] Editorial: synchronize with the DOM Standard · whatwg/html@21c6ec7 (2016-03-20 18:13:58 +09:00 版) https://github.com/whatwg/html/commit/21c6ec77594eb89b836d4872222f5916910967fd

[4] Remove <button type=menu> (domenic著, 2017-02-09 23:55:10 +09:00) https://github.com/whatwg/html/commit/916e1b9f6bea48cb117ddd056ea025adaa629384

[5] Editorial: contextmenu uses MouseEvent (SaschaNaz著, 2017-04-02 23:43:48 +09:00) https://github.com/whatwg/html/commit/74976ccad3e4332ad921b624c2c55219173336e9

[6] Remove the context menu feature (domenic著, 2017-06-09 03:16:29 +09:00) https://github.com/whatwg/html/commit/e7e8c88ecdd7cdc96171f05ab6fe23b56dd48d8a

[7] Treat trusted contextmenu events as user activation (mustaqahmed著, 2018-05-03 01:07:47 +09:00) https://github.com/whatwg/html/commit/51bd770cf58cdd761674df0f47c9f9dfc58c5310

[8] Treat trusted `contextmenu` events as user activation. by mustaqahmed · Pull Request #3659 · whatwg/html (2018-05-03 10:55:41 +09:00) https://github.com/whatwg/html/pull/3659