anchor.diff:  
   |font_style
   |<<font-styles,Font style>> +
  -(default: $base_font_style)
  +(default: _inherit_)
   |lead:
     font_style: bold
   
   |text_transform
   |<<text-transforms,Text transform>> +
  -(default: none)
  +(default: _inherit_)
   |lead:
     text_transform: uppercase
   
  
positive.code: |heading:
    font_family: Noto Serif
  
  |font_size
  |<<values,Number>> +
  (default: $base_font_size)
  |heading:
    font_size: 18
  
  |font_style
  |<<font-styles,Font style>> +
  
negative.code: 
  |border_radius
  |<<values,Number>> +
  (default: _not set_)
  |example:
    border_radius: 4
  
  