// Retina images
//
-// Short retina mixin for setting background-image and -size
+// Short retina mixin for setting background-image and -size. Note that the
+// spelling of `min--moz-device-pixel-ratio` is intentional.
.img-retina(@file-1x; @file-2x; @width-1x; @height-1x) {
background-image: url("@{file-1x}");
@media
only screen and (-webkit-min-device-pixel-ratio: 2),
- only screen and ( min--moz-device-pixel-ratio: 2), // Not a typo
+ only screen and ( min--moz-device-pixel-ratio: 2),
only screen and ( -o-min-device-pixel-ratio: 2/1),
only screen and ( min-device-pixel-ratio: 2),
only screen and ( min-resolution: 192dpi),