Since an EPUB file is a collection of web pages, fonts can be referenced in the CSS.There are two 2 mechanisms for handling fonts in EPUB files: zip, you can decompress the publication and take a look at all those files. The OCF specs define how all those files end up being packaged in one single container file. Open Container Format (OCF) – As the above descriptions should have made it clear an EPUB document consists of a series of files.Open Packaging Format (OPF) – This part of the specs deals with structural information such as metadata (who is the author and the publisher, what is the title.), the manifest (a list of all the files inside an epub file) and the table of contents.For backward compatibility, a creator can also use DTBook instead of XHTML to encode the content. Many of the new features of CSS3, such as rounded boxes or drop shadows, are not available yet. In EPUB files a subset (limited series of commands) of CSS2 needs to be used. Just like with regular web pages, the styling and layout are defined using cascading style sheets (CSS). Even though you could include the entire content of a book or newspaper in a single page, it is better that such a file doesn’t exceed 300K, both for performance and compatibility reasons. In essence, this means that an EPUB file consists of one or more web pages. Open Publication Structure (OPS) – An EPUB 2.0 file uses XHTML 1.1 to construct the content of a publication.

The page ends with some pointers to other interesting sites.

This page provides a general overview of the EPUB file format. Below is the official logo for EPUB files, published in June 2010 by IDPF. An EPUB publication consists of a single file that has the file extension.

How to open epub file