<!DOCTYPE html>
<html>
<head>
<style type="text/css">
div:first-line { font-size: 80%; color: green; }
</style>
</head>
<body style="-moz-column-width: 1px"><div id="div" style="-moz-column-width: 1px"> <span>Foo bar</span></div></body>
</html>