ackType:{type:String,value:"ui",observer:"_updateType"}},_initialized:!1,attached:function(){e(this._stackHost,this._stackTarget,this.stackType),this._initialized=!0},detached:function(){a(this._stackHost,this._stackTarget,this.stackType)},_stackTargetChanged:function(t,e){t&&this._updateStack()},_updateDepth:function(){this._stackTarget?this._stackTarget.style.setProperty("z-index",this.depth):this._stackHost.style.setProperty("z-index",this.depth)},_updateType:function(t,e){t&&this._updateStack(t,e)},move