anchor.diff:              | IsExpanded
               | Props of IHTMLProp list
               | CustomClass of string
  +            | Modifiers of IModifier list
   
           type internal Options =
               { IsTab : bool
  
positive.code:             | IsActive of bool
              | Props of IHTMLProp list
              | CustomClass of string
  
          type internal Options =
              { IsActive : bool
                CustomClass : string option
                Props : IHTMLProp list }
  
              static member Empty =
                  { IsActive = false
                    CustomClass = None
                    Props = [] }
  
      module Item =
  
  
negative.code:         | IsFixedBottom
          | Props of IHTMLProp list
          | CustomClass of string
          | Modifiers of IModifier list
  
      type internal Options =
          { HasShadow : bool
  