anchor.diff:  |font_color
   |<<colors,Color>> +
   (default: _inherit_)
  -|ulist
  +|ulist:
     marker:
       disc:
         font_color: #ff0000
  
positive.code: |line_height
  |<<values,Number>> +
  (default: _inherit_)
  |ulist
    marker:
      disc:
        line_height: 2
  
negative.code: |font_size
  |<<values,Number>> +
  (default: _inherit_)
  |ulist:
    marker:
      disc:
        font_size: 9
  