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HTM-060aCritical Ingestion Error

EPUB reading systems must ignore secondary viewport meta elements i...

EPUB reading systems must ignore secondary viewport meta elements in fixed-layout documents; viewport declaration "resource" will be ignored.

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What This Error Means in Plain English

EPUBCheck detected EPUB reading systems must ignore secondary viewport meta elements in fixed-layout documents; viewport declaration "resource" will be ignored.. Digital reading systems and bookstores require standard conformance to ensure compatibility across all reading apps.

Why Retailers & EAA Regulations Block This File

Automated book distributors (Apple Books, Amazon KDP, Kobo, and IngramSpark) run strict EPUBCheck validation on ingest and reject non-compliant files.

Technical Specification: W3C EPUBCheck rule HTM-060a: EPUB reading systems must ignore secondary viewport meta elements in fixed-layout documents; viewport declaration "resource" will be ignored.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule HTM-060a in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the HTM-060a specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.