<html>
<head>
<style type="text/css">
.after:after { content: "[after]"; }
.before:before { content: "[before]"; }
.first-letter:first-letter { color: green; font-size: 200%; }
</style>
</head>
<body>
<ul>
    <li><input type="month" value="1982-11" class="after"></li>
    <li><input type="month" value="1982-11" class="before"></li>
    <li><input type="month" value="1982-11" class="first-letter"></li>
</ul>
</body>
</html>