anchor.diff:  
   [source,scala]
   -----------------------------------
  -val loginField = elementId
  +val loginField = elementId()
   
   ...
   
  
positive.code: 
  [source,scala]
  -----------------------------------
  val myForm = elementId
  val pictureFieldName = "picture"
  
  'form(
  
negative.code: val config = KorolevServiceConfig[Future, Boolean, Any](
    stateStorage = StateStorage.default(false),
    serverRouter = ServerRouter.empty[Future, Boolean],
    render = { case _ => 'body('div("Hello akka-http")) }
  )
  
  val korolevRoute = akkaHttpService(config).apply(AkkaHttpServerConfig())
  