2.1.143 [HTML5:2014] Section 8.2.5.5 The rules for parsing tokens in foreign content

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V0317: A U+0000 NULL character does not generate a parse error

The specification states:

 8.2.5.5 The rules for parsing tokens in foreign content
  
     When the user agent is to apply the rules for parsing tokens in foreign content, the 
     user agent must handle the token as follows:
  
         A character token that is U+0000 NULL
             Parse error. Insert a U+FFFD REPLACEMENT CHARACTER character.

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A U+0000 NULL character does not generate a parse error.