GitHub - w3c/epubcheck: Validation tool for EPUBEPUBCheck is the official conformance checker for EPUB publications. EPUBCheck can be run as a standalone command-line tool or used as a Java library. EPUBCheck is open source software, maintained by the DAISY Consortium on behalf of W3C. We Need Your Support!! Financial support is critical to the development of EPUBCheck, the tool we all use to validate EPUB files. We need to make sure that the r
