class Kramdown::Parser::Kramdown

def add_header(level, text, id)
  start_line_number = @src.current_line_number
  @src.pos += @src.matched_size
  el = new_block_el(:header, nil, nil, level: level, raw_text: text, location: start_line_number)
  add_text(text, el)
  el.attr['id'] = id if id
  @tree.children << el
end