<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Reference case for text-decoration-thickness</title>
    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
    <style>
        #box{
            font: 20px/1 Ahem;
            background-color: green;
            height: 4em;
            width: 1em;
        }
    </style>
</head>
<body>
    <p>Test fails if there is any red visible</p>
    <div id="box"></div>
</body>
</html>