[1] [CITE@en-GB-x-Hixie[Web Forms 2.0]]
([TIME[2009-01-05 20:07:15 +09:00]] 版)
<http://www.whatwg.org/specs/web-forms/current-work/#stepup>

[2] [CITE[''''''[''''''whatwg'''''']'''''' More stepUp() and stepDown() comments (was: Re: Forms-related feedback)]]
( ([TIME[2013-01-30 19:43:58 +09:00]] 版))
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2013-January/038826.html>