View source for EPUB

EPUB (in version 3.3 as of 2023-12-21) is a container for ebooks using ZIP for its archive and compression. Most of the content is XHTML or media (usually graphics).

==Contents==
* There must be a file <tt>mimetype</tt> in the toplevel containing the string <tt>application/epub+zip</tt>
* There must be a directory <tt>META-INF</tt> in the toplevel containing:
** <tt>container.xml</tt> specifies one or more ''rootfiles'', using their locations relative to the toplevel:
<pre>
<?xml version="1.0"?>
<container xmlns="urn:oasis:names:tc:opendocument:xmlns:container" version="1.0">
 <rootfiles>
  <rootfile full-path="PATHPATHPATH" media-type="application/oebps-package+xml"/>
 </rootfiles>
</container>
</pre>

==EPUB-specific markup==
Ensure you've referenced <tt>xmlns:epub="http://www.idpf.org/2007/ops</tt> in your <tt>html</tt> tag.

When using reflowable EPUB, there's no real concept of a page, and thus no real concept of footnotes. One can move them to the end of a chapter, but an arguably better solution is a popup. Enclose the footnote text in an <tt>aside</tt> tag ala:
<syntaxhighlight lang="html">
<aside hidden="hidden" epub:type="footnote" id="SOMEID">
 <div class="footnote"><a href="#CALLSITE">*</a> Footnote text.</div>
</aside>
</syntaxhighlight>
Use of <tt>epub:type="footnote"</tt> ought result in the text being hidden, but you might need <tt>hidden="hidden"</tt> in your <tt>aside</tt> tag. Unfortunately, this latter causes problems with the popup text in Calibre (at least version 7.4).
Wrap the callsite with an <tt>a</tt> tag:
<syntaxhighlight lang="html">
<a role="doc-noteref" epub:type="noteref" href="#SOMEID" id>Callsite text.</a>
</syntaxhighlight>
Without <tt>role="doc-noteref"</tt>, you will not get a popup in Calibre.
===Entities===
EPUB3 eliminates all but a few HTML entitites.
* &amp;nbsp; ↦ &amp;#160;

==See also==
* [https://kindlegen.s3.amazonaws.com/AmazonKindlePublishingGuidelines.pdf Kindle Publishing Guidelines] from Amazon