2.1.1 [W3C-EPUB3] Section 2.2. Reading System Conformance

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V0001: The EPUB fallback chains are not honored

The specification states:

 > 2.2 Reading System Conformance
  
 An EPUB Reading System must meet all of the following criteria:
  
 EPUB 3 Processing 
     ...
     > It must process the Package Document as defined in Package Document — Reading 
     System Conformance, and honor all presentation logic expressed through the Package 
     Document (e.g., the reading order, fallback chains, bindings, page progression 
     direction and fixed layouts).

EdgeHTML Mode

The EPUB fallback chains are not honored; instead the reader uses the HTML fallback mechanisms.

V0002: The EPUB Canonical Fragment Identifiers scheme for linking is not supported

The specification states:

 > 2.2 Reading System Conformance
  
 An EPUB Reading System must meet all of the following criteria:
  
 EPUB 3 Processing  
     ...
     > It must support the EPUB Canonical Fragment Identifiers scheme [EPUBCFI] for 
     linking, and may support additional linking schemes as defined in the EPUB Linking 
     Scheme Registry.

EdgeHTML Mode

The EPUB Canonical Fragment Identifiers scheme for linking is not supported.