The (text of) format specification underwent reorganization and clean-up format supports remotely-hosted resources and new font formats ( WOFF 2.0 and SFNT) and uses more pure HTML and CSS. The current version of EPUB is 3.2, effective May 8, 2019. New major features include support for precise layout or specialized formatting (Fixed Layout Documents), such as for comic books, and MathML support. The EPUB 3.0 specification became effective in October 2011, superseded by a minor maintenance update (3.0.1) in June 2014.

Ī successor to the Open eBook Publication Structure, EPUB 2.0 was approved in October 2007, with a maintenance update (2.0.1) approved in September 2010. EPUB is the most widely supported vendor-independent XML-based (as opposed to PDF) e-book format that is, it is supported by almost all hardware readers, except for Kindle. The EPUB format is implemented as an archive file consisting of XHTML files carrying the content, along with images and other supporting files. The Book Industry Study Group endorses EPUB 3 as the format of choice for packaging content and has stated that the global book publishing industry should rally around a single standard. It became an official standard of the IDPF in September 2007, superseding the older Open eBook standard. EPUB is a technical standard published by the International Digital Publishing Forum (IDPF).

EPUB is supported by many e-readers, and compatible software is available for most smartphones, tablets, and computers. The term is short for electronic publication and is sometimes styled ePub. EPUB is an e-book file format that uses the '.epub' file extension.

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