@fractalkitty I have an update to this: I switched from the MarkdownIt KaTeX (https://mdit-plugins.github.io/katex.html) plugin to the MathJax (https://mdit-plugins.github.io/mathjax.html) one, and so far it looks like it's working! This is in Eleventy, with the LaTeX math expressions embedded in Markdown.

While KaTeX includes the "output" option (https://katex.org/docs/options) to do HTML, MathML, or both (default: both), the plugin doesn't seem to expose that option, and since the MathJax one does just MathML, it looks right for me in NetNewsWire (macOS) and CapyReader (Android).

The post is here (https://reillyspitzfaden.com/posts/2025/06/reverb-part-1/) and the feed is here (https://reillyspitzfaden.com/blog/feed.xml), and I'd be interested to hear if it's working for other people.

#LaTeX #KaTeX #MathJax #Eleventy #11ty