<!DOCTYPE html>
<script src="resources/srcset-helper.js"></script>
<style>
    #foo {
        width: 100px;
        height: 100px;
        content: url('resources/green-400-px-square.png');
    }
</style>
<div>This test passes if the div below is a blue 100px square when the deviceScaleFactor is 1, and if it is a 100px green square when the deviceScaleFactor is 2.</div>
<div id=foo></div>