I've not tried it myself or seen an example, but given the structure, it would seem like Reveal.js might give you the the sort of functionality you're looking for while having many other affordances one might look for in a digital and/or online zettelkasten.

inspired by question by u/Plastic-Lettuce-7150 at https://www.reddit.com/r/Zettelkasten/comments/168cmca/which_note_taking_app_for_a_luhmann_zettlekasten/

This looks like a reveal.js presentation, but it could be an interesting tool to create online cartoons or comics with.