epubcheck
https://github.com/w3c/epubcheck
Java
The conformance checker for EPUB publications
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- Issues
- Add a `module-info.java` Java module descriptor
- handling multiple mapping documents in container
- edupub heading with alt-less image not a violation
- edupub implicit body test still needs aria-label
- Doesn’t pick up on invalid empty identifier/source
- index semantic isn't restricted to body
- XHTML annotation with MathML descendant content valid or invalid?
- MathML contentequiv annotations are for content mathml
- Message codes revamp
- Report MIME type / file extension mismatch as an informative message
- Docs
- Java not yet supported