Building a minimap like Observable

Hello everyone!
can someone please guide me on creating a minimap like this one:


I want to create a similar map which will show the dependency of the elements.

It looks like it is like an indented tree or a Tangled tree, those notebooks should help you get started.

@hellonearthis Thanks for your reply! Yeah it looks like either indented tree or tangled tree. The interaction between the nodes (the highlighted line) is what I am interested in. Will try to create the interaction from these examples.

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