image-srcset-change-dynamically-from-js-1x.html

<!DOCTYPE html>
<script>
    window.targetScaleFactor = 1;
</script>
<script src="resources/srcset-helper.js"></script>
<script src="../../resources/js-test.js"></script>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
    }
    function updateSrc() {
        var img = document.getElementById("foo");
        // srcset must be set first, otherwise 'src' is loaded as well
        img.srcset = "resources/green-400-px-square.png 2x";
        img.src = "resources/blue-100-px-square.png"
    }
    addEventListener("DOMContentLoaded", function() {
        updateSrc();
    }, false);
    addEventListener("load", function() {
        if (internals)
            shouldBeFalse('internals.isPreloaded("resources/green-400-px-square.png")');
        shouldBeTrue('document.getElementById("foo").clientWidth==100');
    }, false);
</script>
<div>This test passes if this img tag below is a blue square when the scale factor is 1.
    It ensures that attributes can be changed dynamically from javascript, and that only the correct resource is loaded.</div>
<img id="foo">

chromium/third_party/blink/web_tests/fast/hidpi/image-srcset-change-dynamically-from-js-1x.html