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

> @marcoscaceres : On macOS (and on windows I think), browsers that are invoked with the clipboard operation `e.clipboardData.setData('application/mathml+xml', '<math><mfrac><mn>3</mn><mn>5</mn></mfrac></math>');` just put this content as an exotic `org.mozilla.custom-clipdata` or similarly private types with Chrome or Safari.
> Test page here: http://direct.hoplahup.net/tmp/tryclipboardOps.html .
> You will also see that HTML comes through.

So on macOS and other Apple platforms, there is system declared UTI for MathML or SVG. As a result, this isn't really possible in a way that's interoperable across different applications: https://developer.apple.com/library/archive/documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html#//apple_ref/doc/uid/TP40009259

We could declare it as a generic XML content but I don't think that'd help the situation.

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