anchor.diff:          pre(data-control='input-jade')
             code
               :jadesrc
  -              h1 Welcolme to Jade
  +              h1 Welcome to Jade
                 p
                   | Text can be included in a number of
                   | different ways.
  
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: 
      p
        | The jade source for this file can be viewed (and edited/improved) on 
        a(href='https://github.com/visionmedia/jade/blob/gh-pages/src/pages/tutorial.jade') GitHub
  