[1] [CITE[Beyond Standards – 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]] [WEAK[2006-10-01 08:28:04 +00:00]]) [3] [CITE['''['''whatwg''']''' ]] ([TIME[2009-03-30 19:44:44 +09:00]] 版) [4] [CITE@en[(X)HTML5 Tracking]] ([TIME[2009-08-23 16:05:44 +09:00]] 版) [5] [CITE@en[Opera: Opera 11.00 for Windows changelog]] ( ([[Frank M. Palinkas, Technical Writer, Opera Software ASA]] 著, [TIME[2011-04-24 11:17:12 +09:00]] 版)) [6] [CITE@en[Web Applications 1.0 r6248 Add placeholder='' support to type=number.]] ( ([TIME[2011-06-17 07:34:00 +09:00]] 版))