[1] [CITE[XHTML 1.2 - Implements Attribute Module]] ([TIME[2008-12-24 06:07:15 +09:00]] 版) <http://www.w3.org/MarkUp/2008/ED-xhtml12-20081223/implements.html#a_implements>

[2] [CITE@en[Why no script implements - WHATWG Wiki]]
( ([TIME[2010-05-06 10:22:49 +09:00]] 版))
<http://wiki.whatwg.org/wiki/Why_no_script_implements>