Issues

• EPUB 2: six OPS 2.0.1 content document rules are not checked

  w3c/epubcheck#1780 · Filter by author bariskayadelen opened on Nov 14, 2026

• EPUB 3: four container rules and two ZIP structure rules are not checked

  w3c/epubcheck#1779 · Filter by author bariskayadelen opened on Nov 14, 2026

• A second total media:duration and a media:active-class of .active are not reported

  w3c/epubcheck#1778 · Filter by author bariskayadelen opened on Nov 13, 2026

• Seven OCF 2.0.1 requirements are not checked in EPUB 2 books

  w3c/epubcheck#1777 · Filter by author bariskayadelen opened on Nov 13, 2026

• RDFa prefix with more than one space after the colon gives RSC-005

  w3c/epubcheck#1776 · Filter by author bariskayadelen opened on Nov 13, 2026

• Microdata itemtype, itemref and itemid are not checked against itemscope and itemtype

  w3c/epubcheck#1775 · Filter by author bariskayadelen opened on Nov 13, 2026

• IllegalStateException in OCFChecker.checkPublicationVersion when the package document cannot be parsed

  w3c/epubcheck#1774 · Filter by author bariskayadelen opened on Nov 13, 2026

• <script type="module"> is treated as a data block: OPF-015 with the scripted property, nothing without it

  w3c/epubcheck#1773 · Filter by author bariskayadelen opened on Nov 13, 2026

• EPUB 2: UTF-16 files are reported (HTM_058 error, RSC-027 and CSS-003 warnings), though OCF, OPF and OPS 2.0.1 allow UTF-16

  w3c/epubcheck#1772 · Filter by author bariskayadelen opened on Nov 13, 2026

• EPUB 2: three EPUB 3.3 container rules are applied to OCF 2.0.1 (| in file names, names that differ only in normalization, a second OPF rootfile)

  w3c/epubcheck#1771 · Filter by author bariskayadelen opened on Nov 13, 2026

• CSS: the @charset declaration is read more loosely than CSS Syntax 3, and its label is not resolved through the Encoding Standard (CSS-004, CSS-003, CSS-008)

  w3c/epubcheck#1770 · Filter by author bariskayadelen opened on Nov 13, 2026

• dir=" rtl" and <bdo dir="auto"> are accepted in EPUB 3 content documents

  w3c/epubcheck#1769 · Filter by author bariskayadelen opened on Nov 13, 2026

• CSS-008 is an error for CSS that EPUB 3.3 allows (parse errors, nested rules, bad urls)

  w3c/epubcheck#1768 · Filter by author bariskayadelen opened on Nov 13, 2026
  1

• General Query Regarding EPUBCheck v5.4.0 Release Status and Compatibility

  w3c/epubcheck#1767 · Filter by author Koraseeka13051305 opened on Nov 13, 2026

• Doesn't Handle Nesting Selector (&)?

  w3c/epubcheck#1765 · Filter by author ourichermath opened on Nov 12, 2026
  1

• EPUB 2: an object's fallback (a nested object, or text) is not counted, so RSC-032 is reported

  w3c/epubcheck#1764 · Filter by author bariskayadelen opened on Nov 11, 2026

• HTM-047: a valueless viewport property followed by a space is reported as a syntax error

  w3c/epubcheck#1763 · Filter by author bariskayadelen opened on Nov 11, 2026

• HTM-057: viewport width and height accept 0, and reject +1200 and .5

  w3c/epubcheck#1762 · Filter by author bariskayadelen opened on Nov 11, 2026
  1

• EPUB 2: five differences from OPF 2.0.1 (dc-metadata, dc:language, fallbacks, ncx version)

  w3c/epubcheck#1761 · Filter by author bariskayadelen opened on Nov 9, 2026

• EPUB 3: an img with no alt is not reported, though HTML requires checkers to report it

  w3c/epubcheck#1760 · Filter by author bariskayadelen opened on Nov 9, 2026

• SVG title: a nested svg element is accepted, though EPUB 3.3 allows only HTML-namespace markup

  w3c/epubcheck#1759 · Filter by author bariskayadelen opened on Nov 9, 2026

• Navigation document: a heading is required on other nav types and hgroup is accepted, unlike EPUB 3.3 section 7.3

  w3c/epubcheck#1758 · Filter by author bariskayadelen opened on Nov 9, 2026

• Files that must never be encrypted are not reported when encryption.xml lists them

  w3c/epubcheck#1757 · Filter by author bariskayadelen opened on Nov 8, 2026
  1

• Elements and attributes from other namespaces in container.xml are reported as RSC-005

  w3c/epubcheck#1754 · Filter by author bariskayadelen opened on Nov 8, 2026
  2

• -mode exp -save since 5.3.0 writes NTFS + extended-timestamp ZIP extra fields on every entry except mimetype; distributors reject the EPUB ("Zip consistency problem while reading central directory entry")

  w3c/epubcheck#1751 · Filter by author pamarty opened on Nov 6, 2026