[1] Web Applications 1.0 r5961 ( (2011-03-21 19:50:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=5960&to=5961

[2] HTML Speech Incubator Group Final Report ( (2011-12-05 17:46:22 +09:00 版)) http://www.w3.org/2005/Incubator/htmlspeech/XGR-htmlspeech-20111206/#dfn-src

[3] Deprecate mediagroup/MediaController? · Issue #192 · whatwg/html (2015-10-01 23:18:37 +09:00 版) https://github.com/whatwg/html/issues/192

[4] Remove MediaController and media element's mediagroup attribute ( (annevk著, 2016-05-12 02:40:01 +09:00)) https://github.com/whatwg/html/commit/634698e70ea4586d58c989fa7d2cbfcad20d33e6