我在学习CSS的过程中，
遇到了下面的这种用法。
background:none!important
和
cursor: pointer !important;
想问一下各位高手，这是什么意思？？
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应该为的是IE7也会支持：background:none;和cursor:pointer
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我觉得应该是，使用！important属性的样式，Firefox、Opera等浏览器才会识别他的优先级，而ie中不会识别！important的样式，也就是这两行代码，是过滤ie的吧，个人见解！
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<style type="text/css">
span{
visibility: hidden;
}
a{
background:url(http://img1.qq.com/lady/pics/12105/12105393.jpg) no-repeat left top;
width:158px; height:200px;display:block; border:1px solid #FFFFFF; float:right;overflow:hidden;
}
a:active,a:hover{ cursor:pointer}
a:hover span,a:active span{position:absolute;top:0px; z-index:20px; left:0px; visibility: visible;}
img{ width:400px; height:280px; border:7px solid #FFFFFF};
</style>
<body>
<a href="# "><span><img src="a2.jpg" alt="图片说明" /></span></a>
</body>
</html>
实例二：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<style type="text/css">
span{
visibility: hidden;
}
a{
background:url(http://img1.qq.com/lady/pics/12105/12105393.jpg) no-repeat left top;
width:158px; height:200px;display:block; border:1px solid #FFFFFF; float:right;overflow:hidden;
}
a:hover span,a:active span{position:absolute;top:0px; z-index:20px; left:0px; visibility: visible;}
img{ width:400px; height:280px; border:7px solid #FFFFFF};
</style>
<body>
<a href="# "><span><img src="a2.jpg" alt="图片说明" /></span></a>
</body>
</html>
发现只是少了一句： a:active,a:hover{ cursor:pointer}；下面的效果就出不来了。
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