[1] [[manakai]] makes use of some user data names (as used with
[CODE(DOMm)@en[[[getUserData]]]] and [CODE(DOMm)@en[[[setUserData]]]]
methods of [CODE(DOMi)@en[[[Node]]]] interface) for its own purpose.

[2]
,User Data Name,Value,Description
,[CODE(DOM)@en[[[manakai_has_reference]]]],[CODE(IDL)@en[[[boolean]]]],"[CODE(perl)@en[[[Whatpm::HTML]]]] sets this user data to [CODE(HTMLa)@en[[[charset]]]] attribute of [CODE(HTMLe)@en[[[meta]]]] element, as a flag whether the attribute contains any character entity reference or not.  This user data is referenced by [CODE(perl)@en[[[Whatpm::ContentChecker::HTML]]]] for conformance checking of [CODE(HTMLa)@en[[[charset]]]] attribute."