To make things even more simple, that css interpreter doesn't need to parse standard CSS but just the commands EN decides to consider, like the one I'm proposing. It can perfectly be inlined in html, no need for separate stylesheets, to keep it simple. They only need to plug a CSS interpreter to the clients and process 'page-break-after / page-break-before'. Just because EN uses HTML, pagebreaking can be implemented in a pretty straitghtforward way. What I don’t expect is that it will ever get the same amount of control over the layout like a word processor that is build from scratch around pages. I hope EN will add more page layout controls. The „Print Note“ menu option was a first step.
So basically teaching it to print is like a second skin over the same content It does not mimic physical pages - other apps do, like GoodNotes 5. EN uses HTML, and it optimizes the representation of content to show on very different devices in a consistent way.
