$ java -jar epubcheck.jar For\ The\ Love\ of\ Go\ -\ Data.epub
Validating using EPUB version 3.2 rules.
ERROR(RSC-007): For The Love of Go - Data.epub/EPUB/styles/stylesheet1.css(8,3): Referenced resource "EPUB/styles/fonts/SourceSerifPro-Regular.ttf" could not be found in the EPUB.
ERROR(RSC-007): For The Love of Go - Data.epub/EPUB/styles/stylesheet1.css(19,3): Referenced resource "EPUB/styles/fonts/RobotoSlab-VariableFont_wght.ttf" could not be found in the EPUB.
Check finished with errors
Messages: 0 fatals / 2 errors / 0 warnings / 0 infos
$ java -jar epubcheck.jar For\ The\ Love\ of\ Go\ -\ Behaviour.epub
Validating using EPUB version 3.2 rules.
ERROR(RSC-005): For The Love of Go - Behaviour.epub/EPUB/nav.xhtml(11,5012): Error while parsing file: The a element must not appear inside a elements.
ERROR(RSC-005): For The Love of Go - Behaviour.epub/EPUB/nav.xhtml(11,5012): Error while parsing file: Anchors within nav elements must contain text
ERROR(RSC-012): For The Love of Go - Behaviour.epub/EPUB/text/ch007.xhtml(128,144): Fragment identifier is not defined.
Check finished with errors
Messages: 0 fatals / 3 errors / 0 warnings / 0 infos