[1] Bug 25897 – focusin and focusout should be included in the "focus update steps" ( (2014-05-29 04:59:12 +09:00 版)) https://www.w3.org/Bugs/Public/show_bug.cgi?id=25897

[2] IRC logs: freenode / #whatwg / 20140528 ( (2014-05-29 20:54:25 +09:00 版)) http://krijnhoetmer.nl/irc-logs/whatwg/20140528#l-763

[3] Don't repeat events defined in other specs. · w3c/svgwg@ba6ff23 (2016-02-06 12:34:05 +09:00 版) https://github.com/w3c/svgwg/commit/ba6ff23e1e90914465633294eebc091f6065e0d6

[4] Don't repeat events defined in other specs. · w3c/svgwg@ba6ff23 (2016-02-06 12:34:11 +09:00 版) https://github.com/w3c/svgwg/commit/ba6ff23e1e90914465633294eebc091f6065e0d6

[5] Figure out what to do with focusin/focusout · Issue #88 · w3c/uievents (2018-02-28 18:17:42 +09:00) https://github.com/w3c/uievents/issues/88

[6] 25897 – focusin and focusout should be included in the "focus update steps" (2018-02-28 18:23:02 +09:00) https://www.w3.org/Bugs/Public/show_bug.cgi?id=25897

[7] Shim focusin/focusout in all browsers? · Issue #3123 · jquery/jquery (2018-02-28 18:23:34 +09:00) https://github.com/jquery/jquery/issues/3123