image-srcset-density-and-width-descriptors.html

<!DOCTYPE html>
<script>
    window.targetScaleFactor = 2;
</script>
<script src="resources/srcset-helper.js"></script>
<script src="../../resources/js-test.js"></script>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
    }
    addEventListener("load", function() {
        shouldBeTrue('document.getElementById("foo").clientWidth==100');
    }, false);
</script>
<div>This test passes if the image below is a blue square, since the srcset resource doesn't load, as it has both 'w' and 'x' descriptors.</div>
<img id="foo" src="resources/blue-100-px-square.png" srcset="resources/green-400-px-square.png 100w 2x">

chromium/third_party/blink/web_tests/fast/hidpi/image-srcset-density-and-width-descriptors.html