html | 无js二级菜单

1. 效果图

2. 代码

<meta charset="utf-8"><style>
.hiddentitle{display:none;}nav ul{list-style-type: none;background-color: #001f3f;overflow:hidden; /* 父标签加这个，防止有浮动子元素时，该标签失去高度*/margin: 0;padding: 0;border-bottom: 1px solid white;font-size: 1.6em;
}ul > li > ul {font-size: 1em;border:1px solid #bbb;
}nav li{float: left;border-right: 1px solid #bbb;}nav li a{display: inline-block; /* display the list items inline block so the items are vertically displayed */color: white;text-align: center;padding: 14px 16px;text-decoration: none; /* removes the underline that comes with the a tag */
}nav li a:hover{background-color: #39CCCC;
}nav>ul>li>ul{display: none;position: absolute;background-color: #f9f9f9;/*min-width: 160px;z-index: 1;*/
}nav>ul>li>ul li{display: block;float: none;overflow: hidden;
}nav>ul>li>ul li a { /* styling of the links in the submenu */color: black;padding: 12px 16px;text-decoration: none;display: block;text-align: left;
}nav>ul>li>ul a:hover {background-color: #f1f1f1;
}
nav>ul>li:hover ul {display: block;float: bottom;overflow: hidden;
}
</style>menu without js, test under chrome.<nav><h2 class="hiddentitle">Menu</h2><ul><li><a href="#stats0">Summary Statistics</a></li><li><a href="#plots">Plots2</a><ul><li><a href="#a1">Weighted histogram of read lengths</a></li><li><a href="#a2">Weighted histogram of read lengths after log transformation</a></li><li><a href="#a3">Non weighted histogram of read lengths</a></li><li><a href="#a4">Non weighted histogram of read lengths after log transformation</a></li><li><a href="#a5">Yield by length</a></li></ul></li><li><a href="#function">Function</a></li><li><a href="#logs">Logs2</a><ul><li><a href="#b1">logs1</a></li><li><a href="#b2">log2</a></li></ul></li></ul></nav>a new line. v2.2
<p>
this is a new line 
this is a new line 
this is a new line 
this is a new line 
this is a new line 
this is a new line 
this is a new line 
</p>