2.1.134 [HTML5:2014] Section 8.2.4.45 Markup declaration open state

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V0308: A non-HTML namespace CDATA section is not consumed properly and does not switch state

The specification states:

 ... Markup declaration open state
     ...
     Otherwise, if there is an adjusted current node and it is not an element in the HTML 
     namespace and the next seven characters are a case-sensitive match for the string 
     "[CDATA[" (the five uppercase letters "CDATA" with a U+005B LEFT SQUARE BRACKET 
     character before and after), then consume those characters and switch to the CDATA 
     section state.

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A non-HTML namespace CDATA section is not consumed properly and does not switch state.