anchor.diff:  |===
   |Key |Value Type |Example
   
  -3+|*Key Prefix:* ulist-marker-<type>^[1]^
  +3+|[#key-prefix-ulist-marker-type]*Key Prefix:* <<key-prefix-ulist-marker-type,ulist-marker-<type>{zwsp}>>^[1]^
   
   |content
   |<<quoted-string,Quoted string>>
  
positive.code: |===
  |Key |Value Type |Example
  
  3+|[#key-prefix-role]*Key Prefix:* <<key-prefix-role,role-<name> >>
  
  |font-color
  |<<colors,Color>> +
  
negative.code: |heading:
    margin-bottom: 9.6
  
  3+|[#key-prefix-heading-level]*Key Prefix:* <<key-prefix-heading-level,heading-h<n>{zwsp}>>^[1]^
  
  |align
  |<<text-alignments,Text alignment>> +
  