The current code swaps the horizonal and vertical offsets in its toString() output.


Here's a patch for the file org/w3c/css/properties/css3/CssBackgroundPosition.java :

Index: CssBackgroundPosition.java
===================================================================
--- CssBackgroundPosition.java	(revision 8290)
+++ CssBackgroundPosition.java	(working copy)
@@ -439,21 +439,22 @@
 
         public String toString() {
             StringBuilder sb = new StringBuilder();
+            if (horizontal != null) {
+                sb.append(horizontal);
+                if (horizontal_offset != null) {
+                    sb.append(' ').append(horizontal_offset);
+                }
+                if (vertical != null) {
+                    sb.append(' ');
+                }
+            }
+
             if (vertical != null) {
                 sb.append(vertical);
                 if (vertical_offset != null) {
                     sb.append(' ').append(vertical_offset);
                 }
-                if (horizontal != null) {
-                    sb.append(' ');
-                }
             }
-            if (horizontal != null) {
-                sb.append(horizontal);
-                if (horizontal_offset != null) {
-                    sb.append(' ').append(horizontal_offset);
-                }
-            }
             return sb.toString();
         }
     }