<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<bindings xmlns="http://www.mozilla.org/xbl"><binding id="empty"><content></content></binding></bindings>
<style>
.bef:before { content: counter(c); }
.fl:first-letter { }
</style>
<script>
function boom()
{
document.getElementById("xblize").style.MozBinding = "url('#empty')";
}
</script>
</head>
<body onload="boom();">
<div class="fl"><span class="bef" id="xblize"></span><span class="bef"></span></div>
</body>
</html>