CSS3菜单实例，运用纯CSS3技术实现一款下拉手风琴菜单功能，其实不能说是关闭，应该来说是折叠或收缩了，点击菜单面板右上角的小三角，本级菜单的子菜单项就会折叠收起来，貌似关闭了一样，这种菜单也叫手风琴菜单，有很多这样的菜单是使用jQuery插件来实现的，本款只使用了CSS3技术，还是比较有参考价值的。
<!DOCTYPE HTML>
<html lang=zh-cn>
<head>
<meta charset=utf-8>
<title>css3可关闭的菜单导航</title>
<style>
*{margin:0px;padding:0px;}
body{background:#b1b1b1;margin:0px;padding:0px;font-size:14px;color:#000;}
ul.menu,
ul.menu ul {padding:0;margin:0;list-style:none;position:relative;width:200px;background:#ddd;font-family:arial, sans-serif;}
ul.menu {z-index:100;padding:10px;border-radius:10px 10px 0 0;margin:0 auto;}
ul.menu ul {z-index:50;border-radius:0 0 10px 10px;
-webkit-transition: 0.5s;
-moz-transition: 0.5s;
-ms-transition: 0.5s;
-o-transition: 0.5s;
transition: 0.5s;
}
ul.menu li {line-height:30px;position:relative;text-indent:10px;}
ul.menu > li {margin-top:2px;font-size:12px;}
ul.menu > li a {font:normal 12px/30px arial, sans-serif;color:#fff;text-decoration:none;}
ul.menu label.open {display:block;background:#c00 url("images/d-arrow.gif") no-repeat 170px 12px;line-height:30px;position:relative;z-index:100;font:normal 12px/30px arial, sans-serif;color:#fff;border-radius:10px 10px 0 0;}
ul.menu label.open b {color:#ff0;}
ul.menu span {display:block;background:#c00;line-height:30px;position:relative;z-index:100;border-radius:10px 10px 0 0;}
ul.menu label img {position:absolute;left:0;top:0;width:100%;height:30px;}
ul.menu ul li {margin-top:-30px;
-webkit-transition: 0.5s;
-moz-transition: 0.5s;
-ms-transition: 0.5s;
-o-transition: 0.5s;
transition: 0.5s;
}
ul.menu ul li a {display:block;font:normal 11px/30px arial, sans-serif;color:#000;background:#ccc;}
ul.menu ul li a:hover {background:#ddd;}
ul.menu input {position:absolute;left:-9999px;}
ul.menu li input:checked + label {background:#069;}
ul.menu li input:checked ~ ul {background:#ccc;padding-bottom:10px;}
ul.menu li input:checked ~ ul li {margin-top:0;}
ul.menu label.close {display:block;width:200px;height:30px;background:transparent url("images/u-arrow.gif") no-repeat 170px 12px;line-height:30px;position:relative;left:0;z-index:90;margin-top:-30px}
ul.menu input.tabs:checked ~ label.close {display:block;z-index:200;}
ul.menu input.close:checked + label.close {display:none;}
ul.menu input.close:checked ~ ul {background:#ddd;padding-bottom:0;}
ul.menu input.close:checked ~ ul li {margin-top:-30px;}
</style>
</head>
<body>
<ul class="menu">
<li><a href="#"><span>首页</span></a></li>
<li>
<input type="radio" name="tab1" id="tab1a" class="tabs">
<label for="tab1a" class="open" accesskey="2">
<img src="images/trans.gif" alt="">买东西 [2] <b>[3]</b>
</label>
<input type="radio" name="tab1" id="tab1ac" class="tabs close">
<label for="tab1ac" class="close" accesskey="3">
<img src="images/trans.gif" alt="">
</label>
<ul>
<li><a href="#">出售廉价</a></li>
<li><a href="#">互联网商品</a></li>
<li><a href="#">世界产品</a></li>
<li><a href="#">环卫商品</a></li>
<li><a href="#">文件和衣服</a></li>
</ul>
</li>
<li><input type="radio" name="tab1" id="tab1b" class="tabs" checked="checked"><label for="tab1b" class="open" accesskey="4"><img src="images/trans.gif" alt="">服务器 [4] <b>[5]</b></label>
<input type="radio" name="tab1" id="tab1bc" class="tabs close"><label for="tab1bc" class="close" accesskey="5"><img src="images/trans.gif" alt=""></label>
<ul>
<li><a href="#">印刷产品</a></li>
<li><a href="#">相片修改</a></li>
<li><a href="#">hdsjdhjs</a></li>
</ul>
</li>
<li><input type="radio" name="tab1" id="tab1c" class="tabs"><label for="tab1c" class="open" accesskey="6"><img src="images/trans.gif" alt="">联系我们 [6] <b>[6]</b></label>
<input type="radio" name="tab1" id="tab1cc" class="tabs close"><label for="tab1cc" class="close" accesskey="7"><img src="images/trans.gif" alt=""></label>
<ul>
<li><a href="#">支持我们</a></li>
<li><a href="#">出售的上篇</a></li>
<li><a href="#">买的产品</a></li>
<li><a href="#">相 片</a></li>
<li><a href="#">卡片</a></li>
</ul>
</li>
<li><input type="radio" name="tab1" id="tab1d" class="tabs"><label for="tab1d" class="open" accesskey="8"><img src="images/trans.gif" alt="">商品地址 [8] <b>[3]</b></label>
<input type="radio" name="tab1" id="tab1dc" class="tabs close"><label for="tab1dc" class="close" accesskey="9"><img src="images/trans.gif" alt=""></label>
<ul>
<li><a href="#">南半球亚马逊</a></li>
<li><a href="#">北半球亚马逊</a></li>
<li><a href="#">中间三不管</a></li>
</ul>
</li>
<li><input type="radio" name="tab1" id="tab1e" class="tabs"><label for="tab1e" class="open" accesskey="F"><img src="images/trans.gif" alt="">联系我们 [F] <b>[G]</b></label>
<input type="radio" name="tab1" id="tab1ec" class="tabs close"><label for="tab1ec" class="close" accesskey="G"><img src="images/trans.gif" alt=""></label>
<ul>
<li><a href="#">邮箱地址</a></li>
<li><a href="#">电 话</a></li>
<li><a href="#">固定电话</a></li>
<li><a href="#">家庭地址</a></li>
</ul>
</li>
<li><a href="#"><span>超超超</span></a></li>
</ul>
</body>
</html>
