class Kramdown::Converter::Html

def inner(el, indent)

afterwards.
Pushes +el+ onto the @stack before converting the child elements and pops it from the stack

to be the amount of indentation used for the element +el+.
Return the converted content of the children of +el+ as a string. The parameter +indent+ has 
def inner(el, indent)
  result = ''
  indent += @indent
  @stack.push(el)
  el.children.each do |inner_el|
    result << send(DISPATCHER[inner_el.type], inner_el, indent)
  end
  @stack.pop
  result
end