    # File lib/nokogiri/xml/node.rb, line 780
          def to_xhtml options = {}
            # FIXME: this is a hack around broken libxml versions
            return dump_html if Nokogiri.uses_libxml? && %w[2 6] === LIBXML_VERSION.split('.')[0..1]

            options[:save_with] |= SaveOptions::DEFAULT_XHTML if options[:save_with]
            options[:save_with] = SaveOptions::DEFAULT_XHTML unless options[:save_with]
            serialize(options)
          end