See BookNook.biz
I've no connection, but the boss posts very knowledgeably here.
I've never had HTML issues. But I only edit HTML and CSS in books from elsewhere for my own reading. I don't edit any HTML or CSS in books we produce. Either MS Word or LibreOffice Writer (depending on author), a save as docx and conversion with Calibre.
Depends on headings, styles, anchors, images and fonts etc all being totally sensible for ebooks. Tablet Page Profile.
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