+@media (min-resolution: 1.25dppx) {
+ #step-over {
+ list-style-image: url(debugger-step-over@2x.png);
+ -moz-image-region: rect(0px, 32px, 32px, 0);
+ }
+
+ #step-over:hover {
+ -moz-image-region: rect(0px, 64px, 32px, 32px);
+ }
+
+ #step-in {
+ list-style-image: url(debugger-step-in@2x.png);
+ -moz-image-region: rect(0px, 32px, 32px, 0);
+ }
+
+ #step-in:hover {
+ -moz-image-region: rect(0px, 64px, 32px, 32px);
+ }
+
+ #step-out {
+ list-style-image: url(debugger-step-out@2x.png);
+ -moz-image-region: rect(0px, 32px, 32px, 0);
+ }
+
+ #step-out:hover {
+ -moz-image-region: rect(0px, 64px, 32px, 32px);
+ }
+}
+