Limitations in compatibility of JWebEngine and the default Java Classes of java.swing.text:
 - the InetHtmlDocument extends the HTMLDocument API, but is not backwards compatible to it
 - some of the default actions of Java don't work on the View generated by JWebEngine as for instance
   DefaultEditorKit.EndLineAction and DefaultEditorKit.BeginLineAction. JWebEngine installs it's own
   actions on the JTextPanes, it the InetHtmlEditorKit is used.  