anchor.diff:  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.$convert(content, options); // <1>
  +var html = Opal.Asciidoctor.$convert(content); // <1>
   console.log(html); // <2>
   ```
   
  
positive.code: 
  [.output]
  ....
  <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
  
negative.code: var content = "http://asciidoctor.org[*Asciidoctor*] " +
      "running on http://opalrb.org[_Opal_] " +
      "brings AsciiDoc to Node.js!";
  var html = processor.$convert(content); // <5>
  console.log(html); // <6>
  ```
  
  