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css/sass/bourbon/css3/_hidpi-media-query.scss

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+// HiDPI mixin. Default value set to 1.3 to target Google Nexus 7 (http://bjango.com/articles/min-device-pixel-ratio/)
+@mixin hidpi($ratio: 1.3) {
+  @media only screen and (-webkit-min-device-pixel-ratio: $ratio),
+  only screen and (min--moz-device-pixel-ratio: $ratio),
+  only screen and (-o-min-device-pixel-ratio: #{$ratio}/1),
+  only screen and (min-resolution: round($ratio * 96dpi)),
+  only screen and (min-resolution: $ratio * 1dppx) {
+    @content;
+  }
+}