anchor.diff:  
   * IntelliJ IDEA - my (Gernot) best (programming) friend.
   
  -* Of course, Groovy, Gradle and JUnit.
  +* Of course, Groovy, Gradle, JUnit and Spockframework.
   
   
   == Ideas and Origin
  
positive.code: 
  === Multiple Definitions of Bookmarks or ID's
  If any is defined more than once, any anchor linking to it will be confused :-)
  
  === Broken External Links
  *planned*
  
negative.code: 
  == Usage
  
  The plugin adds a new task named `htmlSanityCheck`.
  
  This task exposes a few properties as part of its configuration:
  
  [horizontal]
  sourceDir:: (mandatory) directory where the html files are located. Type: File. Default: `build/docs`.
  sourceDocumentNames:: (optional) an override to process several source files, which may be a subset of all
                        files available in [x-]`${sourceDir}`. Type: FileCollection.
                        Defaults to all files in [x-]`${sourceDir}`.
  
  checkingResultsDir:: (optional) directory where the checking results written to.
                        Defaults to `${sourceDir}/report/htmlchecks/`
  
  checkExternalLinks:: (optional, planned) if set to "true", external references are checked too.
                        Defaults to `false` (currently not implemented)
  
  
  .build.gradle
  [source,groovy]
  