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Merge pull request #18105 from twbs/simpler-retina

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Simplify .img-retina mixin and add explanatory comments
This commit is contained in:
Mark Otto 2015-11-01 21:40:21 -08:00
commit bfa392b097
1 changed files with 6 additions and 5 deletions
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11
scss/mixins/_image.scss
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@ -21,12 +21,13 @@
@mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {
background-image: url($file-1x);
// Autoprefixer takes care of adding -webkit-min-device-pixel-ratio and -o-min-device-pixel-ratio,
// but doesn't convert dppx=>dpi.
// There's no such thing as unprefixed min-device-pixel-ratio since it's nonstandard.
// Compatibility info: http://caniuse.com/#feat=css-media-resolution
@media
only screen and (-webkit-min-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),
only screen and ( min-resolution: 2dppx) {
only screen and (min-resolution: 192dpi), // IE9-11 don't support dppx
only screen and (min-resolution: 2dppx) { // Standardized
background-image: url($file-2x);
background-size: $width-1x $height-1x;
}