anchor.diff:                  h3 Rise your hand, please!
   
               section
  -                code.language-javascript
  -                    pre.
  -                        Array.prototype.slice.call(arguments, 0);
  -
  -            section
                   h1 JavaScript is GREAT
                   h2 Runs on browser 
                   h2 AMAZING features
  -                h2 Ugly!
  +                
  +            section
  +                h1 Ugly!
   
               section
                   h2 How we can make JS better?
  
positive.code:                         console.log(a) for a in [1, 2, 3, 4]
  
              section
                  code.language-coffeescript
                      pre.
                          foo = (a + 1 for a in [1, 2, 3, 4])
  
              section
                  h2 Expressions make your code shorter
                  h3 Shorter is better
  
              section
                  h2 &#10003; Preserve JS awsomeness
  
negative.code:                                 alert @name + " moved \#{meters}m."
  
                          new Animal('dog').move 3
  
              section
                  h2 Don't be scared
  
              section
                  h2 Non-JS confusion
  