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

C0002: Embedded scripts and obfuscated fonts are 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 may support an arbitrary set of Foreign Resource types, and must process 
     fallbacks for unsupported Foreign Resources as defined in Restrictions and Fallbacks 
     if not.

EdgeHTML Mode

These Foreign Resource types are not supported: embedded scripts and obfuscated fonts.

C0004: XML 1.1 OPF, navigation, and content documents are not supported

The specification states:

 > 2.2 Reading System Conformance
  
 An EPUB Reading System must meet all of the following criteria:
 ...
 Backward Compatibility 
     › It should process EPUB version 2 Publications as defined in [OPF2], [OPS2] and 
     [OCF2].

EdgeHTML Mode

XML 1.1 OPF, navigation, and content documents are not supported.

C0003: Media Type application/pls+xml 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  
     ...
     › Unless specified as conditional behavior in this section, it must support all Core 
     Media Type Resources.

EdgeHTML Mode

Media Type application/pls+xml (see section 5.1 of [W3C-EPUB3]) is not supported.