[NaNaN]

Agreed. Most new Markdown parsers for higher speed have different edge cases, including the famous marked.

If you don't mind the frustrating syntax tree, you can try Strictdown (not Markdown), and get some insights to make a better one. (I'm now lazy to update it.) https://github.com/jakwings/strictdown

[rhythmvs]

Strictdown looks thorough: well-done! Added to the inventory of Markdown parsers and resources.¹

SkrivML² is another thoughtful take on lightweight markup, next generation.

¹ https://github.com/rhythmus/markdown-resources/ ² http://markup.skriv.org/

[NaNaN]

Thank you! Wonderful collections!