<!doctype html>
<html>
<head>
    <style>
        target::after {
            content:"WebKit!";
            color: white;
            background-color: green;
        }
        target::after::after, ::after::after, target::after::after::after, ::after::after::after {
            background-color: red;
            color: black;
        }
    </style>
</head>
<body>
    <p>Verify that selectors with duplicated ::after pseudo elements never match. If the test pass, you should see a box with a green background an the test "WebKit!" written in white.</p>
    <target></target>
</body>
</html>