anchor.diff:            | Display Format:
             a(href="#" class="help" id="formatHelp") ?
             span
  +            input(id="detailed" type="radio" name="formatGroup" value="detailed" data-bind="checked: chosenFormat")/
  +            label(for="detailed") Detailed
               input(id="abbreviated"type="radio" name="formatGroup" value="abbreviated" data-bind="checked: chosenFormat")/
               label(for="abbreviated") Abbreviated
  -            input(id="detailed" type="radio" name="formatGroup" value="detailed" data-bind="checked: chosenFormat")/
  -            label(for="detailed") Detailed
           li
             | Styling:
             a(href="#" class="help" id="styleHelp") ?
  
positive.code:       var viewModel = {
          chosenCollection: ko.observable(collections),
          chosenLimit: ko.observable(noItems),
          chosenFormat: ko.observable('abbreviated'),
          chosenStyle: ko.observable('yes'),
          latestUrl: ''
        };
  
negative.code:           a(id="advanced" href="#" class="action") Advanced
          li(style="display:none" id="otherFormats")
            h1 Other formats
            a(href="#" id="jsonp") JSONP
            a(href="#" id="html") HTML
            a(href="#" id="js") JavaScript
  