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Tag: Regex Sanitizing

October 8, 2026

How to Resolve EPUBCheck HTM_004 and HTM_011 Entity Errors in EPUB 3?

EPUB 3.3 defines XHTML Content Documents strictly as XML serializations conforming to the W3C Extensible Markup Language (XML) 1.0 (Fifth Edition) specification. Under XML 1.0 §4.6, only five character entity…
Read more: How to Resolve EPUBCheck HTM_004 and HTM_011 Entity Errors in EPUB 3?

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