The 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 in...