anchor.diff:  (default: 0.5)
   |example:
     border_width: 0.75
  +
  +|font_color
  +|<<colors,Color>> +
  +(default: _inherit_)
  +|example:
  +  font_color: #262626
  +
  +|font_family
  +|<<fonts,Font family name>> +
  +(default: _inherit_)
  +|example:
  +  font_family: M+ 1p
  +
  +|font_size
  +|<<values,Number>> +
  +(default: _inherit_)
  +|example:
  +  font_size: 13
  +
  +|font_style
  +|<<font-styles,Font style>> +
  +(default: _inherit_)
  +|example:
  +  font_style: italic
  +
  +|text_transform
  +|none {vbar} uppercase {vbar} lowercase +
  +(default: _inherit_)
  +|example:
  +  text_transform: uppercase
  +
  +|padding
  +|<<measurement-units,Measurement>> {vbar} <<measurement-units,Measurement[top,right,bottom,left]>> +
  +(default: [12, 12, 0, 12])
  +|example:
  +  padding: [15, 15, 0, 15]
   |===
   
   === Admonition
  
positive.code: 
  3+|*Key Prefix:* lead
  
  |font_size
  |<<values,Number>> +
  (default: 13.5)
  |lead:
    font_size: 13
  
  |line_height
  |<<values,Number>> +
  (default: 1.4)
  
negative.code: |base:
    font_size: 10.5
  
  // font_size_large is a variable, not an official key
  //|font_size_large
  //|<<values,Number>>
  //|base:
  //  font_size_large: 13
  
  |font_size_min
  |<<values,Number>> +
  (default: 9)
  |base:
    font_size_min: 6
  
  // font_size_small is a variable, not an official key
  //|font_size_small
  //|<<values,Number>>
  //|base:
  //  font_size_small: 9
  
  |font_style
  |<<font-styles,Font style>> +
  