[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/#valueasnumber>

[2] [CITE@en[Remove the valueAsDate branch from valueAsNumber]]
([[annevk]]著, [TIME[2016-07-06 15:28:28 +09:00]])
<https://github.com/whatwg/html/commit/4ac4e10c8d5cc7fad67190365e4f823b64ad085d>