Updated W3C Recommendation: EPUB 3.3

The Publishing Maintenance Working Group has published an updated EPUB 3.3 Recommendation. 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. This specification defines the authoring requirements for EPUB 3 publications and represents the third major revision of the standard. The update includes a number of minor changes, primarily to clarify some details on the conformance requirements of EPUB 3 documents.

The Working Group has also published three First Public Working Drafts: EPUB 3.4, EPUB Reading Systems 3.4, and EPUB Accessibility 1.1.1. These drafts will eventually evolve into the next major version of the EPUB 3 standard (EPUB 3.4). For more information, please refer to the Publishing Maintenance Working Group Charter.