Silverbullet note making app has a page on how they deal with Markdown, and where it diverges from the standard.

The bidirectional takes the form of linked mentions underneath a linked to note. That's common even in wiki I think these days. Any tools out there that link closer to like Ted Nelson proposed? Within a pkm tool bidirectional linking into a specific spot in a note should be somehow doable. Transclusion is a step further even, but if I can link to a paragraph, that paragraph should be able to link to where it is cited, no? In Obsidian the ^ link is still one way, while origin and source are known for it to work (the reference number)

Silverbullet, making the rounds in #pkm tooling circles last few days. Works on file system, but that needs to be on a web server. Client is a progressive web app. Browser loads all of it, and then it's local on device and can work offline.