image-set.expected.css

.image {
  background-image: url(img/test.png);
}
@media (min-resolution: 144dpi) {
  .image {
    background-image: url(img/test-2x.png);
  }
}
@media (min-resolution: 600dpi) {
  .image {
    background-image: url(my-img-print.png);
  }
}