[1] Recommend that user agents automatically focus the window · b47219d · whatwg/notifications ( (2014-10-10 02:54:40 +09:00 版)) https://github.com/whatwg/notifications/commit/b47219de8b9d60729e6a6f93657e9dc947974bfb

[2] Meta: disambiguate focus() and blur() for Window and HTMLElement (zcorpan著, 2017-10-20 10:21:55 +09:00) https://github.com/whatwg/html/commit/fde99312b1f788dbdd3bd7579ca8c40a067d5d50

[3] Meta: Disambiguate focus() and blur() for Window and HTMLElement by zcorpan · Pull Request #3138 · whatwg/html (2017-10-21 16:22:43 +09:00) https://github.com/whatwg/html/pull/3138

[4] Clarify Window's focus() and blur() (annevk著, 2019-02-23 01:14:08 +09:00) https://github.com/whatwg/html/commit/12969e1c0a9a95eab967fd1505eb4197ecdd5653

[5] Clarify Window's focus() and blur() by annevk · Pull Request #4377 · whatwg/html (2019-07-15 20:24:32 +09:00) https://github.com/whatwg/html/pull/4377