anchor.diff:  
   |heading_margin_top
   |<<measurement-units,measurement>>
  -|margin_top: $vertical_rhythm * 0.2
  +|margin_top: $vertical_spacing * 0.2
   
   |heading_margin_bottom
   |<<measurement-units,measurement>>
  
positive.code: |vertical_spacing: 10
  |===
  
  //NOTE: Vertical and horizontal rhythm are used for vertical and horizontal spacing, respectively, when there a specific theme key is not defined for a certain purpose.
  //These keys predated the CSS-style theme system and are planned to be phased out.
  
  === Link
  
  [cols="3,3,5m"]
  
negative.code:   font_size: 12
    line_height_length: 17
    line_height: $base_line_height_length / $base_font_size
  vertical_spacing: $base_line_height_length
  heading:
    font_color: #262626
    font_size: 17
    font_style: bold
    line_height: 1.2
    margin_bottom: $vertical_spacing
  link:
    font_color: #002FA7
  outline_list:
  