Add missing MathML tags for annotations. #183

[fred-wang]

New attempt, rebasing on top of master and restricting to annotations.

https://developer.mozilla.org/en-US/docs/Web/MathML/Element/semantics
https://www.w3.org/TR/MathML/chapter3.html#presm.semantics

[willkg]

The sanitizer is built to make sure the output is safe regardless of what the input was. So in order to approve adding these, I need to feel confident that these are safe to add.

There's this comment which you wrote that talks about the safety of adding these bits:

#181 (comment)

However, I don't know anything about MathML and can't evaluate that, so I can't approve this. We'll need someone who understands this to yay/nay it preferably with some proof. I'll hunt around and see if I can find someone I know.

[willkg]

I can't find anyone. I'm going to nix this from the 1.0 milestone.

[fred-wang]

@willkg What's the plan on this? Did you ask @jruderman ?

[willkg]

@fred-wang I didn't find anyone, so I nixed it from the 1.0 milestone. After I got 1.0 out, I stepped off of this project.