[1] Bug 25897 – focusin and focusout should be included in the "focus update steps" ( ( 版)) <https://www.w3.org/Bugs/Public/show_bug.cgi?id=25897>
[2] IRC logs: freenode / #whatwg / 20140528 ( ( 版)) <http://krijnhoetmer.nl/irc-logs/whatwg/20140528#l-763>
[3] Don't repeat events defined in other specs. · w3c/svgwg@ba6ff23 ( 版) <https://github.com/w3c/svgwg/commit/ba6ff23e1e90914465633294eebc091f6065e0d6>
[4] Don't repeat events defined in other specs. · w3c/svgwg@ba6ff23 ( 版) <https://github.com/w3c/svgwg/commit/ba6ff23e1e90914465633294eebc091f6065e0d6>
[5] Figure out what to do with focusin/focusout · Issue #88 · w3c/uievents () <https://github.com/w3c/uievents/issues/88>
[6] 25897 – focusin and focusout should be included in the "focus update steps" () <https://www.w3.org/Bugs/Public/show_bug.cgi?id=25897>
[7] Shim focusin/focusout in all browsers? · Issue #3123 · jquery/jquery () <https://github.com/jquery/jquery/issues/3123>