实例：
<html>
<head>
<title>Glow发光特效</title>
<style>
<!--
body{
margin:12px;
background-color:#000000;
}
span{
font-family:Arial, Helvetica, sans-serif;
height:100px; font-size:80px;
color:#ff9c00; /* 文字金黄色 */
filter:glow(color=#FFFF99,strength=6); /* 发黄色光 */
}
-->
</style>
</head>
<body>
<span>CSS发光滤镜</span>
</body>
</html>
