<html>
    <head>
        <style type="text/css">
            div {
                background-color: red;
                border: 1px solid black;
                width: 100px;
                height: 100px;
            }

            :matches(:matches(div + div)) {
                background-color: green;
            }
        </style>
    </head>
    <body>
        <p>If the test pass, there should be one red block followed by 3 green blocks.</p>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </body>
</html>