EPUB 3.3 becomes a W3C Recommendation

Author(s) and publish date


Composite showing the epub logo and a diagram of the various containers that constitute an epub file: content document such as xhtml and svg and other resources such as CSS, png, mp3, mov which constitute the publication resources, nested within what constitute the EPUB publication that is made of a package document and navigation document, and all of this is wrapped within the EPUB containerThe EPUB 3 Working Group has published EPUB 3.3, EPUB Reading Systems 3.3 and EPUB Accessibility 1.1 as W3C Recommendations, as part of the Digital Publishing activity.

EPUB 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.

The content specification, which is what publishers, creators, or authors are really interested in, is now separate from the reading system specification that is of primary interest for implementers only. Editorial changes made the documents more readable.

Accessibility of EPUB publications was an essential part of the group’s activity. As a result, the EPUB Accessibility specification has been updated and, for the first time in the history of EPUB, is now an integral part of the EPUB Standard. Furthermore, the EPUB Accessibility specification is compatible with the European Accessibility Act whose influence will be significant on Digital Publishing in the years to come.

Finally, please note that this edition of EPUB is dedicated to Garth Conboy, who was one of the original designers of EPUB, and an initiator of the W3C Working Group which produced these new specifications. He is, and will remain, greatly missed.

Please read our Press Release to learn more about this achievement.

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