anchor.diff:  |===
   |Key |Value Type |Example
   
  -3+|*Key Prefix:* prose
  +3+|[#key-prefix-prose]*Key Prefix:* <<key-prefix-prose,prose>>
   
   |margin_top
   |<<measurement-units,Measurement>> +
  
positive.code: |===
  |Key |Value Type |Example
  
  3+|*Key Prefix:* outline_list
  
  |indent
  |<<measurement-units,Measurement>> +
  
negative.code: |===
  |Key |Value Type |Example
  
  3+|[#key-prefix-blockquote]*Key Prefix:* <<key-prefix-blockquote,blockquote>>
  
  |border_width^[1]^
  |<<values,Number>> +
  