tom right bottom; }
   .case.t3 .test { background-position: bottom 100%; }
   .case.t4 .test { background-position: 100% right; }
   .case.t5 .test { background-position: bottom 8px; }
   .case.t6 .test { background-position: 23px right; }
   .case.t7 .test { background-position: center 50% center; }
   .case.t8 .test { background-position: 50% 50% 50%; }
   .case.t9 .test { background-position: center 50% 50%; }
   .case.t10 .test { background-position: 50%, 100%; } /* CSS3 background supports comma */
  