<!DOCTYPE html>
<html>
<script src="../../resources/js-test-pre.js"></script>
<div id="test"> </div>
<script>
description("Tests a flag to make background shorthand property not override background-size when it's already set.");

var e = document.getElementById('test');

if (window.internals) {
    window.internals.settings.setUseLegacyBackgroundSizeShorthandBehavior(true);

    e.style.backgroundSize = "cover";
    e.style.background = "center red url(dummy://test.png) no-repeat border-box";
    shouldBe("e.style.background", "'url(dummy://test.png) center center / cover no-repeat border-box border-box red'")
    shouldBe("e.style.backgroundSize", "'cover'");
    debug("")

    window.internals.settings.setUseLegacyBackgroundSizeShorthandBehavior(false);
}

</script>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>