2.2.1 [HTML5] Section 2.2.1 Conformance classes

C0001: The developer tools preserve the conformance errors and indicate errors either with a message in a console window or with a red underline for the specific error

The specification states:

 2.2.1 Conformance classes
     ...
     Authoring tools and markup generators
         ...
         When an authoring tool is used to edit a non-conforming document, it may preserve 
         the conformance errors in sections of the document that were not edited during 
         the editing session (i.e. an editing tool is allowed to round-trip erroneous 
         content). However, an authoring tool must not claim that the output is conformant 
         if errors have been so preserved.

All document modes (All versions)

The developer tools preserve the conformance errors and indicate errors either with a message in a console window or with a red underline for the specific error.

C0002: Many platform restrictions are in place to prevent denial of service attacks

The specification states:

 2.2.1 Conformance classes
     ...
     User agents may impose implementation-specific limits on otherwise unconstrained 
     inputs, e.g. to prevent denial of service attacks, to guard against running out of 
     memory, or to work around platform-specific limitations.

All document modes (All versions)

Many platform restrictions are in place to prevent denial of service attacks.

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