box-shadow：none | <shadow> [ , <shadow> ]*
<shadow> = inset? && <length>{2,4} && <color>?
默认值：none
适用于：所有元素
继承性：无
动画性：是，除了内、外阴影切换时
计算值：指定值
<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>box-shadow_CSS参考手册_web前端开发参考手册系列</title>
<meta name="author" content="Joy Du(飘零雾雨), dooyoe@gmail.com, www.doyoe.com" />
<style>
.test li {
margin-top: 20px;
list-style: none;
width: 400px;
padding: 10px;
background: #eee;
}
.test .outset {
box-shadow: 5px 5px rgba(0, 0, 0, .6);
}
.test .outset-blur {
box-shadow: 5px 5px 5px rgba(0, 0, 0, .6);
}
.test .outset-extension {
box-shadow: 5px 5px 5px 10px rgba(0, 0, 0, .6);
}
.test .inset {
box-shadow: 2px 2px 5px 1px rgba(0, 0, 0, .6) inset;
}
.test .multiple-shadow {
box-shadow:
0 0 5px 3px rgba(255, 0, 0, .6),
0 0 5px 6px rgba(0, 182, 0, .6),
0 0 5px 10px rgba(255, 255, 0, .6);
}
</style>
</head>
<body>
<ul class="test">
<li class="outset">外阴影常规效果<br />box-shadow:5px 5px rgba(0,0,0,.6);</li>
<li class="outset-blur">外阴影模糊效果<br />box-shadow:5px 5px 5px rgba(0,0,0,.6);</li>
<li class="outset-extension">外阴影模糊外延效果<br />box-shadow:5px 5px 5px 10px rgba(0,0,0,.6);</li>
<li class="inset">内阴影效果<br />box-shadow:2px 2px 5px 1px rgba(0,0,0,.6) inset;</li>
<li class="multiple-shadow">外阴影模糊效果<br />box-shadow:5px 5px 5px rgba(0,0,0,.6);</li>
</ul>
</body>
</html>
box-shadow_CSS参考手册_web前端开发参考手册系列
原文：http://www.cnblogs.com/dabingguai/p/4936305.html