class Kramdown::Converter::Html

def convert_header(el, indent)
  attr = el.attr.dup
  if @options[:auto_ids] && !attr['id']
    attr['id'] = generate_id(el.options[:raw_text])
  end
  @toc << [el.options[:level], attr['id'], el.children] if attr['id'] && in_toc?(el)
  "#{' '*indent}<h#{el.options[:level]}#{html_attributes(attr)}>#{inner(el, indent)}</h#{el.options[:level]}>\n"
end