anchor.diff:  
   == Installation
   
  +ifndef::npm-readme[]
   === Ruby
   
   Install {gem-name} from Rubygems:
  
positive.code: 
  
  === Node.js
  
  Install {gem-name} from npmjs.com:
  
  
negative.code: 
  == Usage
  
  ifndef::npm-readme[]
  === CLI
  
  [source, sh, subs="+attributes"]
  