anchor.diff:          let rvUpdates = Var.Create children.Updates
           let attrUpdates = Attrs.Updates node.Attr
           let updates = View.Bind (View.Map2 (fun () () -> ()) attrUpdates) rvUpdates.View
  -        new Elt'(ElemDoc node, updates, el, rvUpdates, attrUpdates)
  +        new Elt'(ElemDoc node, updates, el, rvUpdates)
   
       [<Inline "$0.elt">]
       member this.Element = elt
  
positive.code:     member this.RemoveClass'(cls: string) =
          elt?className <-
              (elt?className: String).Replace(
                  new RegExp(@"(\s|^)" + cls + @"(\s|$)"),
                  " ")
  
      [<Name "HasClass">]
      member this.HasClass'(cls: string) =
  
negative.code:         As (Doc'.Verbatim' s)
  
  and [<JavaScript; Proxy(typeof<Elt>); Name "WebSharper.UI.Next.Elt">]
      private Elt'(docNode, updates, elt: Dom.Element, rvUpdates: Var<View<unit>>) =
      inherit Doc'(docNode, updates)
  
      static member internal New(el: Dom.Element, attr: Attr, children: Doc') =
  