html dom w3c dom html HTMLCollection w3c dom html HTMLMapElement w3c dom Node htmlmapelementimpl htmlelementimpl htmlmapelement serialversionuid l htmlcollection getareas htmlcollectionimpl htmlcollectionimpl.area name name node clonenode deep htmlmapelementimpl clonednode htmlmapelementimpl super.clonenode deep clonednode._areas clonednode htmlmapelementimpl htmldocumentimpl owner name owner name htmlcollection