Very nice indeed, but how do you save the output?
Once we get a better hosting plan for the generator (and Thanks! to those who joined/will join our Patreon), I'll add permalinking (so sandboxes will be always available through a unique URL). I know that at-least Chrome on Android has a 'download' feature on tablets that allow seeing the page offline (although I think the ToC is missing at the moment). Another option is to download the page from a computer and either send it to your tablet or use a free web hosting service.