ources=] that are in XHTML, SVG, CSS, or various media formats. Beyond these publication resources the EPUB publication includes some EPUB-specific files (e.g, a [=package document=]) whose formats are defined by the EPUB 3.3 standard family. Accordingly, an EPUB 3.3 reading system has to:
        </p>

        <ul>
            <li>interpret and render these standard formats, much like web browsers do; and</li>
            <li>provide some additional features <em>“on top”</em> of that renderer.</li>
 