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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>
<head>
<style>
#kk{
position:relative;
width:300px;
height:300px;
padding:100px;
}
#div1 {
position:absolute;
top:100px;
left:100px;
width:300px;
height:300px;
background:#ccc;
filter:alpha(opacity:50);
-moz-opacity:0.5;
opacity:0.5;
}
#div2 {
position:absolute;
top:100px;
left:100px;
width:300px;
height:300px;
padding:100px;
}
</style>
</head>
<body>
<div id="kk" style="">
我们大家一起玩1!
<div id="div1"></div>
<div id="div2">我们大家一起玩2!</div>
</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<style>
#div1 {
width:200px;
height:200px;
background:#ccc;
filter:alpha(opacity:20);
opacity:0.2;
}
#div1 div {
position:relative;
}
</style>
</head>
<body>
<div id="div1"><div>我们大家一起玩!</div></div>
</body>
</html>