[1] [CITE@en[Web Applications 1.0 r7639     Change stepUp/stepDown algorithm to be more like typical UIs.]]
( ([TIME[2013-01-08 09:47:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=7638&to=7639>

[2] [CITE[''''''[''''''whatwg'''''']'''''' <input type=number> for year input]]
( ([TIME[2014-02-19 08:59:40 +09:00]] 版))
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2014-February/042040.html>

[3] [CITE[''''''[''''''whatwg'''''']'''''' <input type=number> for year input]]
( ([TIME[2014-02-20 01:34:47 +09:00]] 版))
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2014-February/042059.html>

[4] [CITE[''''''[''''''whatwg'''''']'''''' <input type=number> for year input]]
( ([TIME[2014-04-10 20:50:58 +09:00]] 版))
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2014-April/254135.html>