These options are specific to a conversion to EPUB. But because an EPUB file is a compressed archive of HTML files, many of the options in Section 44.4 can have an effect. See Chapter 29 for a more general overview of the conversion to HTML.
Subsection44.6.1EPUB Cover Image
attribute has a value that is a path, relative to the external directory of the managed directories scheme (see Section 5.6), that is an image to be used as a cover for the EPUB. See Chapter 31 for more.