docs: public static void ensureMouseOut(HasHandlers target) {
  
          NativeEvent nativeEvent = Document.get().createMouseOutEvent(
              0,
              0,
              0,
              0,
              0,
              false,
              false,
              false,
              false,
              0,
              null);
          DomEvent.fireNativeEvent(nativeEvent, target);
      }