Back to Error DirectoryW3C EPUBCheck Standard
HTM-046Critical Ingestion Error

Fixed layout document has no "viewport" meta element.

Fixed layout document has no "viewport" meta element.

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Fix all HTM-046 errors in your EPUB automatically

PreFlight checks for HTM-046 issues in memory and provides 1-click remediation during client-side packaging.

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What This Error Means in Plain English

EPUBCheck detected Fixed layout document has no "viewport" meta element.. 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-046: Fixed layout document has no "viewport" meta element.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule HTM-046 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the HTM-046 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.