anchor.diff:  |font_size
   |<<values,Number>> +
   (default: _inherit_)
  -|ulist
  +|ulist:
     marker:
       disc:
         font_size: 9
  
positive.code: |font_family
  |<<fonts,Font family name>> +
  (default: _inherit_)
  |ulist
    marker:
      disc:
        font_family: fa
  
negative.code: 
  |content
  |<<quoted-string,Quoted string>>
  |ulist:
    marker:
      disc:
        content: "\uf140"
  