W3C Invites Implementations of EPUB 3.3, EPUB Reading Systems 3.3, EPUB Accessibility 1.1

Author(s) and publish date


The EPUB 3 Working Group invites implementations of the following three Candidate Recommendation Snapshots:

  • EPUB 3.3 defines the authoring requirements for EPUB publications and represents the third major revision of the standard.
  • EPUB Reading Systems 3.3 defines the conformance requirements for EPUB 3 reading systems — the user agents that render EPUB publications.
  • EPUB Accessibility 1.1 specifies content conformance requirements for verifying the accessibility of EPUB® Publications. It also specifies accessibility metadata requirements for the discoverability of EPUB publications.

EPUB® 3 defines a distribution and interchange format for digital publications and documents. The EPUB format provides a means of representing, packaging, and encoding structured and semantically enhanced web content — including HTML, CSS, SVG, and other resources — for distribution in a single-file container. A separate overview note gives a more detailed view of the specifications.

The specification represents the third major revision and, in particular, a revision of the EPUB 3.2 document published by the EPUB 3 Community Group. This new version is now on a W3C Recommendation Track. There have been only a few technical additions in the areas of internationalization, security, or core media types. The focus of the Working Group have been to align the specifications with the latest W3C specifications, current usage and practices of the publishing industry, improve the readability of the specification, align the accessibility requirement with the latest Web Accessibility standards as well as the European Accessibility Act, and to work on a comprehensive test suite to improve the interoperability of Reading Systems. Read also the detailed change logs in the documents for further details.

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