I'm trying to style a region with multiple background images. A single background image works fine:

   -fx-background-image: url("TestImageLibrary/scrollwork_ul.png");
   -fx-background-position: left top;

Although the CSS docs say that multiple background images and positions are possible, when I add the following:

   -fx-background-image: url("TestImageLibrary/scrollwork_ul.png"), url("TestImageLibrary/scrollwork_lr.png");
   -fx-background-position: left top, right bottom;

Then no background images are displayed.