/ just write your markup as css selector rules, the default tag is div
#html-id.html-class
  / nest things by indenting, never have to worry about closing tags again
  / specify tag name with %
  %ul
    %li.selected= "If you use an equal sign at the end of a tag, you can embed code"
    - 3.times do |i|
      %li= "If you use a - sign it won't output the result of that particular code, useful for control structures like loops ifs etc"