[101] Allow for specifying a sound through a URL · eae0873 · whatwg/notifications ( (2014-11-16 11:34:15 +09:00 版)) https://github.com/whatwg/notifications/commit/eae0873a49d07f4e1ba4bcb03a7db8aec0fa35b6

[7] Remove support for sounds from notifications (beverloo著, 2018-02-28 23:19:53 +09:00) https://github.com/whatwg/notifications/commit/459bf358cae197a5b88c6a227e018756ef4c21cd

[10] Remove support for sounds from notifications by beverloo · Pull Request #127 · whatwg/notifications (2018-03-02 18:10:49 +09:00) https://github.com/whatwg/notifications/pull/127