[1] Web Applications 1.0 r7808 Use more WebIDL, reduce amount of prose. Also, some typo fixes. ( (2013-04-12 07:00:00 +09:00 版)) <http://html5.org/tools/web-apps-tracker?from=7807&to=7808>

[2] Web Applications 1.0 r7961 <track>.kind: Back off on over-zealous enumming ( (2013-06-13 03:09:00 +09:00 版)) <http://html5.org/tools/web-apps-tracker?from=7960&to=7961>

[3] Web Applications 1.0 r7961 <track>.kind: Back off on over-zealous enumming ( (2013-06-13 03:09:00 +09:00 版)) <http://html5.org/tools/web-apps-tracker?from=7960&to=7961>

[4] Fix #293: Change 'invalid value default' for <track kind> to metadata · whatwg/html@0829f33 (2016-01-30 21:02:31 +09:00 版) <https://github.com/whatwg/html/commit/0829f3302b8f73e5332846a1a44ac5a565b88918>