anchor.diff:  
   
   //- Headlines Helper Mixin
  +    level - [integer] 1, 2, 3, 4, or 5
   
   mixin headline(level)
       if level == 1
  
positive.code: 
  
  //- SVG from map
  
  mixin svg(file, name, width, height)
      svg(aria-hidden="true" viewBox="0 0 #{width} #{height || width}" width=width height=(height || width))&attributes(attributes)
  
negative.code: 
  
  //- Terminal-style code window
      label - [string] title displayed in top bar of terminal window
  
  mixin terminal(label)
      .x-terminal
  