I would love if it was possible to further drill down into topics (expand further in already expanded parts, up to many levels deep). I long ago hoped to one day try and write an explanation of Shor's algorithm in such a format, with many layers of drill-down available, to cater to readers of different level of knowledge. And also with possibility to collapse back the areas, and bookmark a specific expanded state of the text.
Is collapsing back also allowed, as I asked above? :) didn't see any clear UX indication to that effect :( Not 100% essential (I guess could try adding it as a contribution if the others were there), but how about the bookmarking aspect I also mentioned?
