[aglionby]

This sounds fantastic and is something I've broadly thought about for a little while. A little while back someone else linked a concept of what they had done with the idea -- initially a paragraph was visible, and some of the words had a coloured box around them which could be clicked to expand on that term, all the while maintaining a flowing prose. So, I think a slightly different goal to what you describe (it was technical writing I think?), but similar enough. Unfortunately I didn't save it and have previously (frustratingly) spent at least an hour looking for it to no avail, so I'm curious to see what you come up with!

[chdaniel]

If you ever find it again, send it my way please! Indeed it would be very useful for complex concepts explanations. Definitely not do tabloids or anything like that — though it might... help?

It's essentially the reverse way of what writers do when they write the "tweet version" of their essay — plus all the steps in-between.

@ your last sentence: Check out the InVision link I've added to the OP!

[yan]

I believe what you’re looking for is: https://www.telescopictext.org/ (demo is at .com)