[DiapDealer]

There's usually hoops you can jump through to fix some quirk of some particular rendering system, but those workarounds can also expose new quirks on different systems. You end up chasing your own tail for mostly no gain.

The heading tag causing a page-break on Moon Reader is probably one of those quirks. But there may also be a Moon Reader user setting that stops that from happening (I've no idea for sure: Moon Reader's user preferences are dauntingly all-encompassing). The point is that Moon Reader users who the page-breaks bother will know about such a setting and "fix it", and those who it doesn't bother won't be bothered by it.