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.
This call is the object of this issue.

When you have MathML in a web-page and try to copy it, you obtain HTML with, sometimes the MathML in it.

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