def method_missing(name, *args)
  puts "<#{name}>#{args[0]}"
  yield if block_given?
  puts "</#{name}>"
end

html do
  body do
    h1 "My internal DSL"
    div do
      span "HTML generation engine in 4 lines"
      ul do
        li "take a look at Markaby"
        li "at least once"
        li "for some more ideas"
      end
    end
  end
end