anchor.diff:  
   [,yaml]
   ----
  +extends: default
   header:
     height: 0.75in
     line-height: 1
  
positive.code: 
  [,yaml]
  ----
  footer:
    height: 0.75in
    line-height: 1.2
  
negative.code: 
  [,yaml,subs=attributes+]
  ----
  extends: default
  header:
    height: 0.75in
    image-vertical-align: 2 {conum-guard-yaml} <1>
  