anchor.diff:  
   
     body
  -    br
  -
  -    .example
  -      .documentation
  -        h2 Masthead signed in
  -        p Generated with mastheadSignedIn() mixin
  -      header(role="banner")
  -        +mastheadSignedIn
  -
  -
   
       .middle-container
  +      .example
  +        .documentation
  +          h2 Masthead signed out
  +          p Generated with mastheadSignedOut() mixin
  +        header(role="banner")
  +          +mastheadSignedOut
  +
  +      .example
  +        .documentation
  +          h2 Masthead signed in
  +          p Generated with mastheadSignedIn() mixin
  +        header(role="banner")
  +          +mastheadSignedIn
   
         .example
           .documentation
  
positive.code:           p The optional autofocus param decides whether it should gain focus on page visit.
          +addQuestionForm()
  
      br
  
      +javascriptIncludeTag("scripts.min")
negative.code:     +javascriptIncludeTag("modernizr.min")
      +stylesheetLinkTag("modern","screen")
      style.
        body {
          padding: 2em 0;
        }
        .example {
          padding: 2em 0;
        }
  