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In Sigil, to make an epub3 more compatible with epub2, you should use the epub3 tools menu to create the epub2 NCX toc.ncx and update the opf guide from the current epub3 nav.
And using correct fallback css is also important.
Just understand there are a bunch of old broken epub2 and even some broken epub3 e-readers out there.
Last edited by KevinH; 11-09-2024 at 07:37 PM.
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