image-set-background-with-zoom.html

<!DOCTYPE html>
<style>
  #standard {
    background-image: image-set(
      url('resources/blue-100-px-square.png') 1x,
      url('resources/green-400-px-square.png') 2x
    );
  }

  #prefixed {
    background-image: -webkit-image-set(
      url('resources/blue-100-px-square.png') 1x,
      url('resources/green-400-px-square.png') 2x
    );
  }

  .foo {
    width: 100px;
    height: 100px;
  }
</style>

<script>
  if (window.testRunner)
    testRunner.zoomPageIn();
</script>

<div>
  This test passes if the divs below are green squares.
</div>
<br>
<div id="standard" class="foo"></div>
<br>
<div id="prefixed" class="foo"></div>

chromium/third_party/blink/web_tests/fast/hidpi/image-set-background-with-zoom.html