Returns content for cover page as HTML string. Content will be of type 'str' (Python 2) or 'bytes' (Python 3).

        :Returns:
          Returns content of this document.

def get_content(self):
        """
        Returns content for cover page as HTML string. Content will be of type 'str' (Python 2) or 'bytes' (Python 3).

        :Returns:
          Returns content of this document.
        """

        self.content = self.book.get_template('cover')

        tree = parse_string(super(EpubCoverHtml, self).get_content())
        tree_root = tree.getroot()

        images = tree_root.xpath('//xhtml:img', namespaces={'xhtml': NAMESPACES['XHTML']})

        images[0].set('src', self.image_name)
        images[0].set('alt', self.title)

        tree_str = etree.tostring(tree, pretty_print=True, encoding='utf-8', xml_declaration=True)

        return tree_str