graphics/node/Visible_b.fx

Wait till the image like a REF1 will be shown on the Screen. Press on "Left" key to change the Node. Since the Node appears on the Screen and press any key to make the Node invisible. Type and click on area where the Node was.

But "Left" key pressing turns on invisible mode and no any reaction after this.

It is possible that it is test but or bug in test description.