For my startup, which is built around Markdown notecards[1], we've been using markdown-it, which it seems is also being leveraged by the Markdoc project. So far

For my startup, which is built around Markdown notecards[1], we've been using markdown-it, which it seems is also being leveraged by the Markdoc project. So far I've written a couple of extensions for markdown-it and haven't really had any issues. [1] https://supernotes.app https://supernotes.app