anchor.diff:  |base:
     font_size: 10.5
   
  -|font_size_large
  -|<<values,Number>>
  -|base:
  -  font_size_large: 13
  -
  -|font_size_small
  -|<<values,Number>>
  -|base:
  -  font_size_small: 9
  +// font_size_large and font_size_small aren't official keys
  +//|font_size_large
  +//|<<values,Number>>
  +//|base:
  +//  font_size_large: 13
  +//
  +//|font_size_small
  +//|<<values,Number>>
  +//|base:
  +//  font_size_small: 9
   
   |font_size_min
   |<<values,Number>> +
   (default: 9)
   |base:
  -  font_size_small: 6
  +  font_size_min: 6
   
   |font_style
   |normal {vbar} italic {vbar} bold {vbar} bold_italic +
  
positive.code: |link:
    font_color: #428bca
  
  |font_family
  |<<fonts,Font family name>>
  |link:
    font_family: Roboto
  
  |font_size
  |<<values,Number>>
  |link:
    font_size: 9
  
  |font_style
  |normal {vbar} italic {vbar} bold {vbar} bold_italic
  |link:
    font_style: normal
  |===
  
  === Literal inline
  
negative.code: |===
  
  . `<n>` is a number ranging from 1 to 6, representing each of the six heading levels.
  . The `toc_title` keys inherit from level-2 heading styles, except where noted.
  
  === Running header & footer
  
  