epubcheck
https://github.com/w3c/epubcheck
Java
The conformance checker for EPUB publications
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- Issues
- Epubcheck error caused by CSS pseudo class :has
- EPUBCheck not reporting the xmlns:epub error
- "Non-linear content must be reachable," error for OEBPS/cover.xhtml in epubcheck 5.0.0: why?
- Error in error message...
- CLI epubcheck checking more than one file at a time
- XHTML annotation with MathML descendant content valid or invalid?
- Message codes revamp
- EPUBCheck not reporting missing the # in refines="ID" in opf
- EDUPUB's new dc:type is "education"
- Checking expanded EPUB shouldn't create an .epub
- Docs
- Java not yet supported