Back to Error DirectoryW3C EPUBCheck Standard
MED-015Retailer Warning

Media overlay text references must be in reading order. Text target...

Media overlay text references must be in reading order. Text target "resource" is before the previous link target in resource order.

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What This Error Means in Plain English

EPUBCheck detected Media overlay text references must be in reading order. Text target "resource" is before the previous link target in resource order.. 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 MED-015: Media overlay text references must be in reading order. Text target "resource" is before the previous link target in resource order.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule MED-015 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the MED-015 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.