anchor.diff:  . A user configures the location (directory and filename) of an HTML file,
   . and the corresponding images directory.
   . kbd:[HtmlSC] performs various checks on the HTML and
  -. reports its results either on the console or as file.
  +. reports its results either on the console or as HTML report.
   
   kbd:[HtmlSC] can run from the command line or as {gradle-url}-plugin.
   
  
positive.code: [[DuplicateLinkTargets]]
  Duplicate link targets:: Links can have multiple identical link-targets (several id attributes with the same name).
    See <<DuplicateLinkTargetsChecker>>.
  
  [[BrokenExternalLinks]]
  Broken external links:: External links can be broken - due to myriads of reasons: misspelled, link-target currently offline,
  
negative.code: .Required Checks
  |===
  | ID | Check | Description
  | [MissingImageFiles]      R-1 | missing image files | Check all image tags if the referenced
                                    image files exist.
                                    See <<MissingImageFilesChecker>>
  | [BrokenCrossReferences]  R-2 | broken internal links | Check all internal links from anchor-tags
                                    (href="XYZ") if the link targets "XYZ" are defined.
                                    See <<BrokenCrossReferencesChecker>>
  | [MissingLocalResources]  R-3  | missing local files, either other html-files, pdf's or similar.
                                    See <<MissingLocalResourcesChecker>>
  | [DuplicateLinkTargets]   R-4  | duplicate link targets | Check all bookmark definitions
                                    (... id="XYZ") whether the id's ("XYZ") are unique.
                                    See <<DuplicateLinkTargetsChecker>>
  |                          R-5  | Malformed links | Check all links for syntactical correctness
  | [MissingImgAltAttribute] R-6  | missing alt-attribute in image-tags.
                                    See <<MissingImgAltAttributeChecker>>
  | [UnusedImages]           R-7  | check for files in image-directories that are not referenced by any
                                    of the HTML files in this _run_
  |===
  
  
  