anchor.diff:            IsTransparent : bool
             FixedInfo : string option
             CustomClass : string option
  -          Props : IHTMLProp list }
  +          Props : IHTMLProp list
  +          Modifiers : string option list }
   
           static member Empty =
               { HasShadow = false
  
positive.code:             | Menu.IsActive state -> { result with IsActive = state }
              | Menu.Props props -> { result with Props = props }
              | Menu.CustomClass customClass -> { result with CustomClass = Some customClass }
  
          let opts = options |> List.fold parseOptions Menu.Options.Empty
          let classes =
              Helpers.classes Classes.Menu.Container [opts.CustomClass]
                  [Classes.Menu.State.IsActive, opts.IsActive]
  
          div (classes::opts.Props) children
  
negative.code:         | IsFixedBottom
          | Props of IHTMLProp list
          | CustomClass of string
          | Modifiers of IModifier list
  
      type internal Options =
          { HasShadow : bool
  