anchor.diff:          pre
             code.output
               :htmlsrc
  -              <h1>Welcolme to Jade</h1>
  +              <h1>Welcome to Jade</h1>
                 <p>Text can be included in a number of
                    different ways.</p>
                 <p>This way is shortest if you need big
  
positive.code:         pre(data-control='input-jade')
            code
              :jadesrc
                h1(id="title") Welcolme to Jade
                button(class="btn", data-action="bea").
                  Be Awesome
        .col
          pre(data-control='output-html')
            code
              :htmlsrc
                <h1 id="title">Welcolme to Jade</h1>
                <button class="btn" data-action="bea">
                  Be Awesome
                </button>
  
negative.code:         pre(data-control='input-jade')
            code
              :jadesrc
                h1 Welcome to Jade
                p
                  | Text can be included in a number of
                  | different ways.
  