2.2.1 [W3C-XHTML1.0] Section 3.2, User Agent Conformance

C0001:

The specification states:

 A conforming user agent must meet all of the following criteria:
  
 1.In order to be consistent with the XML 1.0 Recommendation [XML], the user agent
  must parse and evaluate an XHTML document for well-formedness. If the user agent 
 claims to be a validating user agent, it must also validate documents against their 
 referenced DTDs according to [XML].

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

Validation is not performed on documents.

C0002:

The specification states:

 When processing content, user agents that encounter characters or character entity 
 references that are recognized but not renderable may substitute another rendering 
 that gives the same meaning, or must display the document in such a way that it is 
 obvious to the user that normal rendering has not taken place.

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

Another rendering that gives the same meaning is substituted when characters or character entity references are encountered that are recognized but not renderable. If no such rendering is available, the rendering for the replacement character is substituted.

C0003:

The specification states:

 Note that in order to produce a Canonical XHTML document, the rules above must 
 be applied and the rules in [XMLC14N] must also be applied to the document.

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

Canonical XHTML documents are not necessarily created.

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