class Kramdown::Converter::Html

def convert_math(el, indent)
  if (result = format_math(el, indent: indent))
    result
  else
    attr = el.attr.dup
    attr['class'] = "#{attr['class']} kdmath".lstrip
    if el.options[:category] == :block
      format_as_block_html('div', attr, "$$\n#{el.value}\n$$", indent)
    else
      format_as_span_html('span', attr, "$#{el.value}$")
    end
  end
end