[1] [CITE@en[manakai's Conformance Checking Guideline for Obsolete HTML Elements and Attributes]]
( ([TIME[2013-11-18 08:10:41 +09:00]] 版))
<http://suika.suikawiki.org/www/markup/html/exts/manakai-obsvocab>

[2] [CITE@en[manakai's Conformance Checking Guideline for Obsolete HTML Elements and Attributes]]
([TIME[2017-06-17 14:15:21 +09:00]])
<https://manakai.github.io/spec-obsvocab/>