epubcheck
https://github.com/w3c/epubcheck
Java
The conformance checker for EPUB publications
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- Issues
- 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
- VTT validation
- Validate open annotation json files
- Validate `<link rel="prev|next" href=…">`
- EPUB 2.0.1 XHTML Content Documents MUST contain a doctype declaration
- Check prev/next links in Content Documents (issue #975)
- Docs
- Java not yet supported