# before:

      def to_html
        returning table = '' do
          properties.each do |(name, value)|
            table << %()
            table << %()
          end
          table << '
#{CGI.escapeHTML(name.to_s)}
#{CGI.escapeHTML(value.to_s)}
'
        end
      end

# after:

      def to_html
        returning '' do |table|
          properties.each do |(name, value)|
            table << %()
            table << %()
          end
          table << '
#{CGI.escapeHTML(name.to_s)}
#{CGI.escapeHTML(value.to_s)}
'
        end
      end