Back to Error DirectoryW3C EPUBCheck Standard
ACC-005Retailer Warning

Table heading cells should be identified by "th" elements for acces...

Table heading cells should be identified by "th" elements for accessibility.

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Fix all ACC-005 errors in your EPUB automatically

PreFlight checks for ACC-005 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 Table heading cells should be identified by "th" elements for accessibility.. 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 ACC-005: Table heading cells should be identified by "th" elements for accessibility.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule ACC-005 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the ACC-005 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.