anchor.diff:  
   === Heading
   
  -The keys in this category control the style of headings, including titles for parts, chapters, sections and the table of contents, as well as discrete headings.
  +The keys in this category control the style of most headings, including part titles, chapter titles, sections titles, the table of contents title and discrete headings.
   
   [cols="3,4,5l"]
   |===
  
positive.code: |toc:
    h3_font_color: #999999
  
  3+|*Key Prefix:* toc_title
  
  |align
  |left {vbar} center {vbar} right {vbar} justify
  |toc:
    title:
      align: center
  
negative.code: |base:
    font_size: 10.5
  
  // 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_min: 6
  
  |font_style
  |normal {vbar} italic {vbar} bold {vbar} bold_italic +
  