this.cleanBelow = cleanBelow;
this.zIndex = zIndex;
this.opacity = opacity;
this.background = background;
this.clientDocMap = new ClientDocumentStfulMapImpl(getItsNatStfulDocument());
if (element == null) // Usaremos un <div> creado ex profeso
{
this.builtInElement = true;
this.boundToTree = false;