纯CSS3实现多级导航菜单

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以下是纯CSS3实现多级导航菜单的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!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=utf-8" />
<title>CSS3</title>
<link rel="stylesheet" href="css/style.css" media="screen" type="text/css" />
</head>
<body>
<nav>
    <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">Tutorials</a><span class="dropBottom"></span>
            <ul>
                <li><a href="#">Design</a><span class="dropRight"></span>
                    <ul>
                        <li><a href="#">Photoshop</a></li>
                        <li><a href="#">Illustrator</a></li>
                        <li><a href="#">Web Design</a><span class="dropRight"></span>
                            <ul>
                                <li><a href="#">XTHML</a></li>
                                <li><a href="#">CSS</a></li>
                                <li><a href="#">JavaScript</a></li>
                            </ul>
                        </li>
                    </ul>
                </li>
                <li><a href="#">Articles</a></li>
                <li><a href="#">Interviews</a></li>
            </ul>
        </li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
    </ul>
</nav>
</body>
</html>

CSS代码(style.css):

body{background:#00CC99;}
span.dropBottom,span.dropRight{display:block;box-shadow:inset 2px 0px 0px #FF9;position:absolute;left:0px;width:100%;height:100%;top:0px;}
span.dropBottom{box-shadow:inset 0px 2px 0px #FF9;position:absolute;width:100%;bottom:0px;}
nav{display:table;margin:50px auto;box-shadow:0px 2px 0px #023333;}
ul{margin:0;padding:0;list-style:none;}
ul ul{opacity:0;position:absolute;top:160%;visibility:hidden;transition:all .4s ease;-webkit-transition:all .4s ease;}
ul ul ul{top:0%;left:160%;}
ul ul li:hover > ul{top:0%;left:100%;opacity:1;visibility:visible;}
ul li:hover > ul{opacity:1;top:100%;visibility:visible;}
ul li{float:left;position:relative;}
ul ul li{float:none;}
ul li{background-color:#009C75;cursor:pointer;}
ul a{text-decoration:none;display:block;color:#FF9;padding:10px 15px;width:6em;text-align:center;font-family:'Open Sans',sans-serif;text-shadow:0px -1px 0px rgba(0,0,0,.2);}
ul li:hover{background-color:#007373;}
ul li a:hover{background-color:#007373;}

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