How are you creating the azw3 file?
Do you begin with an epub, and convert? If you do that, and convert with kindlegen, or "Kindle Previewer for PC" which uses kindlegen, or convert with Calibre, I think the page-break-before should work.
I have converted epubs that way, and in the Kindle Previewer the page break does work. But I do not have a Kindle device to test it on.
Is your chapter wrapped in a <div> that has page-break-inside: avoid?
Last edited by GrannyGrump; 03-04-2019 at 09:16 PM.
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