anchor.diff:  Existing external link::
     points to https://github.com/aim42
   
  -=== Background
  +==== Background
   
   Html anchor tags contain href attributes, which denote
   the link-target (where the browser shall jump when the appropriate
  
positive.code: Missing image::
  image:nonexisting-image.png[this image deliberately missing]
  
  //end:html-with-errors[]
negative.code: = A Simplistic Asciidoc(tor) Test Document
  :experimental:
  
  // where are images located?
  :imagesdir: ./images
  