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