Back to Error DirectoryW3C EPUBCheck Standard
MED-009Retailer Warning

The time specified in the clipBegin attribute must not be the same ...

The time specified in the clipBegin attribute must not be the same as clipEnd.

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Fix all MED-009 errors in your EPUB automatically

PreFlight checks for MED-009 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 The time specified in the clipBegin attribute must not be the same as clipEnd.. 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-009: The time specified in the clipBegin attribute must not be the same as clipEnd.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule MED-009 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the MED-009 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.