# File lib/maruku/output/to_html.rb, line 483
        def render_section_number
                # if we are bound to a section, add section number
                if num = section_number
                        span = Element.new 'span'
                        span.attributes['class'] = 'maruku_section_number'
                        span << Text.new(section_number)
                        span
                else
                        nil
                end
        end