Back to Error DirectoryW3C EPUBCheck Standard
CSS-019Retailer Warning

CSS font-face declaration has no attributes.

CSS font-face declaration has no attributes.

Automated 1-Click Fix Ready

Fix all CSS-019 errors in your EPUB automatically

PreFlight checks for CSS-019 issues in memory and provides 1-click remediation during client-side packaging.

Scan & Fix Now

What This Error Means in Plain English

EPUBCheck detected CSS font-face declaration has no attributes.. 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 CSS-019: CSS font-face declaration has no attributes.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule CSS-019 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the CSS-019 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.