anchor.diff:  (default: _not set_)
   |title_page:
     logo:
  -    +image: image:logo.png[pdfwidth=25%]+
  +    image: image:logo.png[pdfwidth=25%]
   
   |top
   |Percentage^[3]^ +
  
positive.code: |Inline image macro^[2]^ +
  (default: _not set_)
  |page:
    background_image: +image:page-bg.png[]+
  
  |layout
  |portrait {vbar} landscape +
  
negative.code: 
  |page-background-image^[4]^
  |path^[2]^ {vbar} image macro^[3]^
  |:page-background-image: image:bg.jpg[]
  
  |pagenums^[5]^
  |flag (default: _set_)
  