3 months ago I built a little prototype text-mode browser for a tiny subset of Markdown. Today it's a prototype no longer; it has fairly thorough tests. See how I write tests for the rendering in a language that maps 1:1 to machine code:

http://akkartik.github.io/mu/html/apps/browse/main.mu.html#L81

Old demo: https://archive.org/details/akkartik-2min-2020-05-29

Repo: https://github.com/akkartik/mu

This post is part of my Freewheeling Apps Devlog.

Comments gratefully appreciated. Please send them to me by any method of your choice and I'll include them here.