Re: [w3c/clipboard-apis] supported type should include MathML types (#141)

> Thank you @rniwa for the extra links. I don't see a disagreement except for "it will not work". We had already spotted at the time that media-types are not exactly the same as UTIs. That is why the MathML specification includes UTI specifications:
> 
> * MathML: Macintosh Universal Type Identifier code public.mathml conforming to public.xml
> * MathML-presentation: Macintosh Universal Type Identifier code public.mathml.presentation conforming to public.mathml (described above) conforming to public.xml
> * MathML-content: Macintosh Universal Type Identifier code: public.mathml.content conforming to public.mathml (described above) conforming to public.xml

Presumably you're referring to the [names of MathML encodings](https://www.w3.org/TR/MathML3/chapter6.html#encoding-names). I wasn't aware that this section existed but I don't think this recommendation is sound. `public.` prefix is reserved for the (operating) system. It does follow the general pattern of what Apple defined for other markup languages but it doesn't mean that it's officially sanctioned. Had I been aware of this, I would have raised a concern about this before the spec advanced to the recommendation state.

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