- output_html = etree.tostring(html_tree, method="html", encoding='UTF-8', pretty_print=True)
+ output_html = etree.tostring(html_tree, pretty_print = True,
+ xml_declaration = True,
+ encoding = "utf-8",
+ doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" ' +
+ '"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">')