2.1.135 [HTML5] Section 7.6.2 Making entire documents editable: The designMode IDL attribute

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V0300: The designMode attribute incorrectly has a third state of inherit that should be considered invalid

The specification states:

 7.6.2 Making entire documents editable: The designMode IDL attribute
     ...
     The designMode IDL attribute on the Document object takes two values, "on" and "off". 
     On setting, the new value must be compared in an ASCII case-insensitive manner to 
     these two values; if it matches the "on" value, then designMode must be enabled, and 
     if it matches the "off" value, then designMode must be disabled. Other values must be 
     ignored.

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The designMode attribute incorrectly has a third state of inherit that should be considered invalid.