mathcolor/mathbackground on <math/> and <semantics/> elements?

Hello,

The spec says that mathcolor/mathbackground are accepted on all MathML 
presentation elements:
http://www.w3.org/TR/MathML3/chapter2.html#interf.toplevel.atts

<math/> and <semantics/> are not listed among MathML presentation 
elements, so I think mathcolor/mathbackground should not be allowed on 
them, and this is confirmed by the RelaxNG schema.
http://www.w3.org/TR/MathML3/chapter3.html#presm.summary

However, the two sentences below could be interpreted as saying that 
<math/> accepts mathcolor/mathbackground attributes:

"The math element accepts any of the attributes that can be set on 
Section 3.3.4 Style Change <mstyle>"
"mstyle elements accept the attributes listed in Section 3.1.10 
Mathematics style attributes common to presentation elements. "

and this one for <semantics/>:

"semantics should be considered part of both presentation MathML and 
content MathML"
-- 
Frédéric Wang.
www.maths-informatique-jeux.com <http://www.maths-informatique-jeux.com>
www.maths-informatique-jeux.com/international 
<http://www.maths-informatique-jeux.com/international>