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

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

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

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