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.

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

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

@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.