anchor.diff:  [source]
   ----
   content = '_Zen_ in the art of writing http://asciidoctor.org[AsciiDoc].'
  -document = Asciidoctor.load content, header_footer: true, safe: 'safe'
  +document = Asciidoctor.load content, header_footer: true, safe: :safe
   puts document.doctitle
   html = document.convert
   ----
   
  -Keep in mind, if you don't like the output Asciidoctor produces, _you can change it!_
  -Asciidoctor supports custom {uri-tilt}[Tilt]-supported templates, which to allow you customize the output piecemeal, or custom converters, which give you 100% control over the output.
  -
  -For more information about how to use the API or to customize the output, see the {uri-user-manual}[user manual].
  +Keep in mind that if you don't like the output Asciidoctor produces, _you can change it!_
  +Asciidoctor supports custom converters that can handle converting from the parsed document to the generated output.
  +
  +One easy way to customize the output piecemeal is by using the template converter.
  +The template converter allows you uses supply a {uri-tilt}[Tilt]-supported template file to handle converting any node in the document.
  +
  +However you go about it, you _can_ have 100% control over the output.
  +For more information about how to use the API or to customize the output, refer to the {uri-user-manual}[user manual].
   
   == Contributing
   
  
positive.code: You can then convert an AsciiDoc source file to an HTML file using:
  
  [source]
  Asciidoctor.convert_file 'README.adoc', to_file: true, safe: 'safe'
  
  WARNING: When using Asciidoctor via the API, the default safe mode is `:secure`.
  In secure mode, several core features are disabled, including the `include` directive.
  If you want to enable these features, you'll need to explicitly set the safe mode to `server` (recommended) or `safe`.
  
  You can also convert an AsciiDoc string to embeddable HTML (for inserting in an HTML page) using:
  
  [source]
  ----
  content = '_Zen_ in the art of writing http://asciidoctor.org[AsciiDoc].'
  Asciidoctor.convert content, safe: 'safe'
  ----
  
  If you want the full HTML document, enable the `header_footer` option as follows:
  
negative.code: [.output]
  ....
  Asciidoctor 1.5.2 [http://asciidoctor.org]
  Runtime Environment (ruby 2.2.2p95 [x86_64-linux]) (lc:UTF-8 fs:UTF-8 in:- ex:UTF-8)
  ....
  
  Asciidoctor also provides an API.
  