The linked example is very neat: https://notes.andymatuschak.org/About_these_notes https://notes.andymatuschak.org/About_these_notes The source code is not ava

The linked example is very neat: https://notes.andymatuschak.org/About_these_notes https://notes.andymatuschak.org/About_these_notes The source code is not available, and each mouseover triggers a lot of Ajax calls (one for the note hovered, one for each link in the hovered note), but the experience is quite pleasant.