anchor.diff:              li
                 a(href='#') Page 2
               li
  -              a(href='#') Page 3
  +              a(href='#') Page 3 -->
             ul.nav.navbar-nav.navbar-right
               li
                 a(href='#')
  
positive.code:           ul.nav.navbar-nav
              li.active
                a(href='#') Home
              li.dropdown
                a.dropdown-toggle(data-toggle='dropdown', href='#')
                  | Page 1 
                  span.caret
  
negative.code:     script(src='javascripts/script.js')
      link(rel='stylesheet', href='stylesheets/style.css')
    body
      nav.navbar.navbar-default
        .container-fluid
          .navbar-header
            button.navbar-toggle(type='button', data-toggle='collapse', data-target='#myNavbar')
  