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Old 06-30-2023, 05:11 PM   #36
KevinH
Sigil Developer
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Epubcheck is the only real epub validator that I know about. It is/was created by the people who did the old idpf validator. It is now mantained by Daisy and w3c, I believe.

The epubcheck plugin for Sigil handles that.

See https://github.com/w3c/epubcheck if you want more details.
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