>Browsers don't have native support for MathML any more for a good reason. Mozilla did support this for a while but dropped it because of limited adoption and high maintenance burden.

This seems to just be entirely untrue? https://developer.mozilla.org/en-US/docs/Web/MathML shows wide support (For Chromium/Blink-based since version 109) and if I open the example https://developer.mozilla.org/en-US/docs/Web/MathML/Guides/P... in Firefox and Edge both seem to render it correctly.