[r1qdj0]

The "indented codeblocks" trap is real. That rule alone has caused me more rendering edge cases than I'd like to admit. Funnily enough I ended up in a similar place but from the viewer side. Existing markdown viewers on windows either required installing heavy runtimes or didn't render things consistently. Ended up building my own too. There's something about markdown that keeps pushing people from "I'll just use an existing tool" to "fine I'll build it myself". The style vs procedure thing you brought up is interesting tho. On the rendering side you hit the same tension, should the viewer interpret a custom class as a visual hint or just pass it through?