[zerocrates]

Huh, you're right about what the Firefox reader mode does. I'm somewhat surprised it uses the MathML. I'd just assumed what was happening from the 2pi in the header becoming plain text but that header is probably a special case and just from the page title rather than the h1.

[mgunyho]

Yes, I manually put 2π in the html <title>, while the <h1> has the KaTeX rendered math in it :)