[1] Beyond Standards &#8211; Input placeholders <http://www.beyondstandards.com/archives/input-placeholders/> (名無しさん)

[2] Web Forms 2.0 仕様書の注釈宣言によれば、 Ian Hickson は将来の WF への追加の候補として考えているようです。 (名無しさん 2006-10-01 08:28:04 +00:00)

[3] [whatwg] <textarea placeholder=""> (2009-03-30 19:44:44 +09:00 版) <http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2009-March/019086.html>

[4] (X)HTML5 Tracking (2009-08-23 16:05:44 +09:00 版) <http://html5.org/tools/web-apps-tracker?from=2408&to=2409>

[5] Opera: Opera 11.00 for Windows changelog ( (Frank M. Palinkas, Technical Writer, Opera Software ASA 著, 2011-04-24 11:17:12 +09:00 版)) <http://www.opera.com/docs/changelogs/windows/1100/>

[6] Web Applications 1.0 r6248 Add placeholder= support to type=number.]] ( (2011-06-17 07:34:00 +09:00 版)) <http://html5.org/tools/web-apps-tracker?from=6247&to=6248>

[7] IRC logs: freenode / #whatwg / 20110617 ( (2011-06-25 23:12:29 +09:00 版)) <http://krijnhoetmer.nl/irc-logs/whatwg/20110617>

[8] [whatwg] Should editable elements have placeholder attribute? (2012-06-14 09:13:58 +09:00 版) <http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2012-June/036391.html>

[9] :-moz-placeholderから::-moz-placeholderに - fragmentary ( (2012-11-27 05:02:16 +09:00 版)) <http://myakura.hatenablog.com/entry/2012/11/26/224834>

[10] [whatwg] Hide placeholder on input controls on focus ( (2013-07-30 22:55:12 +09:00 版)) <http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2013-July/040300.html>

[11] プレースホルダとHTML5のplaceholder属性 ( (2013-03-08 18:31:27 +09:00 版)) <http://myakura.github.io/n/placeholder.html>

[12] placeholder をラベル代わりに使って、入力すると何の欄だったかわからなくなる糞フォームが溢れて困ったものです。。。

[13] Web Applications 1.0 r8204 Let's allow newlines in <textarea placeholder=> after all, since there are some valid use cases.]] ( (2013-10-03 03:27:00 +09:00 版)) <http://html5.org/tools/web-apps-tracker?from=8203&to=8204>

[14] IE10 における placeholder 属性をもつ textarea 要素、または value 属性のない type="checkbox" の input 要素の clone に関するはまりどころ - ひだまりソケットは壊れない ( (2014-05-02 09:18:24 +09:00 版)) <http://vividcode.hatenablog.com/entry/ie10/textarea-placeholder-checkbox-default-value>

[15] Web Applications 1.0 r8734 Make placeholder= and autofocus= work better together ( (2014-08-30 06:01:00 +09:00 版)) <http://html5.org/r/8734>

[16] Updated placeholder mapping and moved note · w3c/aria@11713b0 (2015-06-16 20:09:11 +09:00 版) <https://github.com/w3c/aria/commit/11713b049c7a6fa559bbab6296a6c24263ae289a>

[17] Define the :placeholder-shown pseudo-class for HTML elements ( (SimonSapin著, 2016-06-01 00:43:18 +09:00)) <https://github.com/whatwg/html/commit/52d529d35464be2c1a2d2f0d0c0f76d4a49bb9dd>

[18] 12868 – forms: Allow placeholder="" for color and date/time types (2017-07-23 16:37:08 +09:00) <https://www.w3.org/Bugs/Public/show_bug.cgi?id=12868>