[1] HTML Media Extensions Working Group Charter (2016-04-06 00:44:51 +09:00 版) https://www.w3.org/2013/09/html-charter.html

Note: As of December 2, 2015, only the HTML Media Extensions remain to be accomplished within the scope of the charter and the Group was renamed accordingly. Future work on HTML is now happening in the Web Platform Working Group.

[2] W3C HTML Media Extensions Working Group (2015-12-03 00:44:06 +09:00) https://www.w3.org/html/wg/

The Group is currently chartered to continue its work through 31 December 2015.
Note: As of December 2, 2015, only the HTML Media Extensions remain to be accomplished within the scope of the charter and the Group was renamed accordingly. Future work on HTML is now happening in the Web Platform Working Group.