-moz-background-inline-policy: continuous;

   The inline element is considered before line breaking (both
   explicit and caused by wrapping) has occurred, i.e. as one long
   solid rectangular box, for the purposes of tiling the background.


For these tests you will need Todd Fahrner's Ahem font, which you can
download from:

   http://www.hixie.ch/resources/fonts/

Versions for Mac, Unix and Windows are available.