@DiapDealer
Thanks for taking the time to write such a detailed reply. I will begin to tune the "style-map" without forgetting to map this important horizontalline item.
Out of using a manual page break like you advise, there also could probably be a way to provoke an automatic split before h1 (or some other) titles.
If I compare with ODTImport, I use manual pagebreaks to create individual pages for images and, after that, once the EPUB has been created, I use a plain regex to give their body a null margin.
Time to experiment.
