[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/#labels>

[2] [CITE@en[Remove <keygen>]]
([[domenic]]著, [TIME[2017-01-14 07:03:02 +09:00]])
<https://github.com/whatwg/html/commit/5baa38720f6e83c94a50018c4565808ad548d69c>

[3] [CITE@en[Make the labels IDL attribute return null for <input type=hidden>]]
([[zcorpan]]著, [TIME[2017-02-16 02:42:29 +09:00]])
<https://github.com/whatwg/html/commit/596174367314ebc1b935d09e0ca9b66c9362977a>