anchor.diff:  var options = opal.hash({doctype: 'inline', attributes: ['showtitle']});
   var html = processor.$convert(content, options); // <5>
   console.log(html); // <6>
  -----
  +```
  +
   <1> Load the Asciidoctor.js library
   <2> Retrieve and alias the top-level Opal namespace
   <3> Instantiate Asciidoctor with extensions enabled
  
positive.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:
  
  
negative.code: This project uses {uri-opal}[Opal] to transpile http://asciidoctor.org[Asciidoctor], a modern implementation of AsciiDoc, from Ruby to JavaScript to produce _asciidoctor.js_.
  The _asciidoctor.js_ script can be run on any JavaScript platform, including Node.js, Nashorn and, of course, a web browser.
  
  ## Introduction
  
  You can use Asciidoctor.js either for back-end development using {uri-nodejs}[Node.js] or front-end development using a browser.
  
  ## Front-end development
  
  .Installing Asciidoctor.js with Bower
  
      $ bower install asciidoctor.js --save
  
  Once the package installed, you can add the following `script` tag to your HTML page:
  
  ```html
  <script src="bower_components/asciidoctor.js/dist/asciidoctor-all.min.js"></script>
  <!-- If you need docbook backends -->
  <script src="bower_components/asciidoctor.js/dist/asciidoctor-docbook.min.js"></script>
  ```
  
  If you don't want to use *extensions*, you can load files separately :
  
  ```html
  <script src="bower_components/opal/opal/current/opal.min.js"></script>
  <script src="bower_components/asciidoctor.js/dist/asciidoctor-core.min.js"></script>
  <!-- If you need docbook backends -->
  <script src="bower_components/asciidoctor.js/dist/asciidoctor-docbook.min.js"></script>
  ```
  
  Here is a simple example that converts AsciiDoc to HTML5 using the `doctype: 'inline'` option and `showtitle` attribute:
  
  .sample.js
  
  ```javascript
  var content = "http://asciidoctor.org[*Asciidoctor*] " +
      "running on http://opalrb.org[_Opal_] " +
      "brings AsciiDoc to the browser!";
  var options = Opal.hash({doctype: 'inline', attributes: ['showtitle']});
  var html = Opal.Asciidoctor.$convert(content, options); // <1>
  console.log(html); // <2>
  ```
  
  <1> Convert AsciiDoc content to HTML5 using Asciidoctor.js
  <2> Print the HTML5 output to the console
  
  ## Back-end development
  
  .Installing Asciidoctor.js with npm
  
      $ npm install asciidoctor.js --save
  
  Once the package is installed, the first thing to do is to load the `asciidoctor.js` module using `require`, then you're ready to start using the API:
  
  .sample.js
  
  ```javascript
  var asciidoctor = require('asciidoctor.js')(); // <1>
  var opal = asciidoctor.Opal; // <2>
  
  