<!DOCTYPE html>
<html>
<head>
    <title>Reference: Whitespace-only text over images should not receive backplates.</title>
    <style>
        div {
            position: absolute;
        }
        .bg {
            background-image: url("red.png");
            height: 20px;
            width: 20px;
        }
    </style>
</head>
<body>
    <div class="bg"></div>
</body>
</html>