anchor.diff:  
   The {uri-contribute}[Contributing] guide provides information on how to contribute.
   
  -== Copyright
  +## Copyright
   
   Copyright (C) 2015 Dan Allen, Guillaume Grossetie, Anthonny Quérouil and the Asciidoctor Project.
   Free use of this software is granted under the terms of the MIT License.
  
positive.code: <a href="http://asciidoctor.org"><strong>Asciidoctor</strong></a> running on <a href="http://opalrb.org"><em>Opal</em></a> brings AsciiDoc to Node.js!</p>
  ....
  
  == Advanced topics
  
  If you want to know more about _Asciidoctor.js_, please read the {uri-user-manual}[User Manual].
  
  == Contributing
  
  In the spirit of {uri-freesoftware}[free software], _everyone_ is encouraged to help improve this project.
  If you discover errors or omissions in the source code, documentation, or website content, please don't hesitate to submit an issue or open a pull request with a fix.
  
negative.code: 
  Save the file as `sample.js` and run it using the `node` command:
  
      $ node sample.js
  
  You should see the following output in your terminal:
  
  