anchor.diff:  System.out.println(htmlBuffer.toString());
   ----
   
  -==== Safe mode and file system access
  +=== Safe mode and file system access
  +
   Asciidoctor provides security levels that control the read and write access of attributes, the include directive, macros, and scripts while a document is processing. Each level includes the restrictions enabled in the prior security level.
   
   When Asciidoctor (and AsciidoctorJ) is used as _API_, it uses `SECURE` safe mode by default.
  
positive.code: |{empty}
  |===
  
  CAUTION: The artifactId changed to `asciidoctorj` starting in 1.5.0.
  
  == Installation
  
  
negative.code: <3> `push_include` method inserts new content (retrieved from the url) in current position of document.
  
  [source]
  .Register an include processor
  ----
  JavaExtensionRegistry extensionRegistry = this.asciidoctor.javaExtensionRegistry(); // <1>
  
  