Awesome! I hadn’t taken a closer look at pagination.js as it seemed to be a solution for “static” content. I also haven’t added footnote support yet, but since these are less “dynamic”, I guess it’s possible to move them around asynchronously.
As for the basic concept, you nailed it. I’ll make sure to scratch “completely new” from now on. The only difference is that the “pages div” is on the same level as the “editor div”, with a display: content. A few other minor differences, but it’s pretty much the same concept. Edge cases are being handled individually.