epubcheck
https://github.com/w3c/epubcheck
Java
The conformance checker for EPUB publications
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- Issues
- Resources referenced from script element are exempt
- JSON Output for OPF-015 Seems to Be Missing Location Entries
- Outdated features
- Allow pageBreakSource as an unprefixed meta property
- Unknown element does not generate errors
- Context menu item request
- A png when passed thorugh the epubcheck, gets mistaken for JPEG, even tho the magic bytes are correct (when using xxd or hexdump)
- role="doc-pageheader” fails to validate
- EPUB .opf spine > itemref > idref with trailing whitespace
- URL normalization of OCF resources
- Docs
- Java not yet supported