<html>
<head>    
<style>
    #foo {
        width:100px;
        height:100px;
        background-image: image-set(linear-gradient(green, white) 1x);
    }
</style>
</head>

<body id="body">
    <div>This test passes if the div below is a 100px green-white gradient square.</div>
    <div id=foo></div>
</body>
</html>