8 // Keep images from scaling beyond the width of their parents.
11 // Part 1: Set a maximum relative to the parent
13 // Part 2: Override the height to auto, otherwise images will be stretched
14 // when setting a width and height attribute on the img element.
21 // Short retina mixin for setting background-image and -size.
23 @mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {
24 background-image: url($file-1x);
26 // Autoprefixer takes care of adding -webkit-min-device-pixel-ratio and -o-min-device-pixel-ratio,
27 // but doesn't convert dppx=>dpi.
28 // There's no such thing as unprefixed min-device-pixel-ratio since it's nonstandard.
29 // Compatibility info: http://caniuse.com/#feat=css-media-resolution
31 only screen and (min-resolution: 192dpi), // IE9-11 don't support dppx
32 only screen and (min-resolution: 2dppx) { // Standardized
33 background-image: url($file-2x);
34 background-size: $width-1x $height-1x;