Nightly Mozilla builds now include support for the CSS3 properties background-clip and background-origin, although they are prefixed by '-moz-'.
- -moz-background-clip = border | padding
Set to whether the background is drawn under the border, or whether it ends at the padding.
- -moz-background-origin = border | padding | content
Set to indicate where the upper left corner of the background is positioned. This lets one put a background image just behind the content or have it extend into the padding or border as well.