anchor.diff:    title:
       font_style: bold
   
  +|text_transform
  +|none {vbar} uppercase {vbar} lowercase +
  +(default: none)
  +|title_page:
  +  title:
  +    text_transform: uppercase
  +
   |line_height
   |<<values,Number>>
   |title_page:
  
positive.code: |blockquote:
    cite:
      font_style: bold
  |===
  
  === Sidebar
  
negative.code: |base:
    align: justify
  
  |border_color
  |<<colors,Color>> +
  (default: #eeeeee)
  |base:
    border_color: #eeeeee
  
  // border_radius is variable, not an official key
  //|border_radius
  //|<<values,Number>>
  //|base:
  //  border_radius: 4
  
  |border_width
  |<<values,Number>> +
  (default: 0.5)
  |base:
    border_width: 0.5
  
  |font_color
  |<<colors,Color>> +
  (default: #000000)
  