[1] formタグ内のinput type=imageのdisabledを有効化したい http://chaichan.web.infoseek.co.jp/qanda/qa6413.htm

HTMLFormElement.elements に type image の input 要素が含まれない。

[2] Web Forms 2.0 http://www.whatwg.org/specs/web-forms/current-work/#elements

仕様も >>1 を反映している。が、その一方で output とか追加しちゃっていいのか?

[4] >>2 output は新規に追加されたものだから、互換性に影響しないからいいのでしょう。 <input type=image> は今まで含まれていなかったので、 急に含まれるようになっては困る。

[3] Web Applications 1.0 r8446 Turns out browsers reset the form owner not just when a node is taken from a document, but also when it's taken from a subtree. which makes sense. ( (2014-01-31 06:51:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=8445&to=8446

[5] IRC logs: freenode / #whatwg / 20140222 ( (2014-02-23 13:12:52 +09:00 版)) http://krijnhoetmer.nl/irc-logs/whatwg/20140222

[6] IE11 は output 要素を含めないようです。 2015-09-29T09:24:57.900Z

[7] Web Forms 2.0 (2009-01-05 20:07:15 +09:00 版) http://www.whatwg.org/specs/web-forms/current-work/#elements0

[8] Remove legacycaller from two collections · whatwg/html@834a858 (2015-09-30 23:00:16 +09:00 版) https://github.com/whatwg/html/commit/834a8589d2df1977ee8cb1e8b277fa87d5a69a0b

[9] Fix #200: make <fieldset>.elements return a HTMLCollection · whatwg/html@934887d (2016-01-09 11:39:42 +09:00 版) https://github.com/whatwg/html/commit/934887d313305448b7ba6dd3af6f7434e1b600c8

[10] Fix #200: make <fieldset>.elements return a HTMLCollection · whatwg/html@934887d (2016-01-09 11:39:51 +09:00 版) https://github.com/whatwg/html/commit/934887d313305448b7ba6dd3af6f7434e1b600c8

[11] Remove inaccurate fieldset ref in HTMLFormControlsCollection · whatwg/html@b88afb6 (2016-01-12 11:32:28 +09:00 版) https://github.com/whatwg/html/commit/b88afb63ad1d4b0def27c4561e267f15017bdc8a

[12] Editorial: synchronize with the DOM Standard · whatwg/html@21c6ec7 (2016-03-20 18:10:53 +09:00 版) https://github.com/whatwg/html/commit/21c6ec77594eb89b836d4872222f5916910967fd

[13] Remove <label form> and redefine label.form IDL attribute ( (zcorpan著, 2016-04-28 22:48:52 +09:00)) https://github.com/whatwg/html/commit/99f0f1ae017523276ea4dd5784ec63a23a23834d

[14] Remove <keygen> (domenic著, 2017-01-14 07:03:02 +09:00) https://github.com/whatwg/html/commit/5baa38720f6e83c94a50018c4565808ad548d69c

[15] Make form.elements rooted at the document, not the form (hzr著, 2017-06-16 05:28:09 +09:00) https://github.com/whatwg/html/commit/821229b6ec15503b4d692728752390e4c18a6777

[16] Shadow: fix definition of form.elements (hzr著, 2017-08-16 18:34:30 +09:00) https://github.com/whatwg/html/commit/f04efab424301b3c6b074ca1ca7e99160346af2b

[17] form.elements and shadow trees · Issue #2795 · whatwg/html (2017-08-17 13:24:43 +09:00) https://github.com/whatwg/html/issues/2795

[18] Fix definition of form.elements by hzr · Pull Request #2825 · whatwg/html (2017-08-17 13:24:56 +09:00) https://github.com/whatwg/html/pull/2825

[19] Edge では elements に form="" によって関連付けられたフォームコントロールが含まれるにも関わらず、 named index でアクセスできないようです。 2018-12-19T04:58:13.200Z