Use html to implement a three-level menu-HTML Tutorial-php.cn

Use html to implement a three-level menu
First of all, let’s take a look at the renderings:
(Recommended tutorial: html tutorial)
Use html to implement a three-level menu
Full code:
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<!DOCTYPE html>
<html>
  
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>下拉菜单</title>
</head>
<style>
    /*重置浏览器默认样式*/
    * {
        padding: 0;
        margin: 0;
        font-family: "Microsoft YaHei";
        list-style: none;
    }
  
    #main {
        width: 100%;
        background: #3c3c3c;
    }
  
    /* 清楚浮动，使div盒子能被撑起来 */
    .clearfix:after {
        content: "";
        display: block;
        height: 0;
        visibility: hidden;
        overflow: hidden;
        clear: both;
    }
  
    .menu {
        position: relative;
        margin-left: 8%;
    }
  
    /* 每一个li标签的样式 */
    .menu li {
        width: 130px;
        height: 40px;
        /* 行内高度 */
        line-height: 40px;
        /* 文字居中 */
        text-align: center;
        margin-left: 4%;
    }
  
    .menu>li a {
        text-decoration: none;
        color: #2aabd2;
    }
  
    .menu>li {
        /*让一级菜单的li浮动*/
        float: left;
    }
  
    /* 二级菜单样式 */
    .second-menu {
        /* 将二级菜单隐藏 */
        display: none;
        position: absolute;
    }
  
    /* hover属性，鼠标移动到li标签上触发，将对应li标签的耳机菜单显示，移开后恢复到原来样式 */
    .menu li:hover>ul {
        display: block;
    }
  
    .second-menu li a {
        color: #0c0c0c;
    }
  
    .second-menu {
        background: #5a5959;
    }
  
    /* 三级标签样式 */
    .third-menu {
        display: none;
        background: #5a5959;
        position: absolute;
        /* 相对于其父标签（二级标签）进行绝对定位 */
        margin-left: 125px;
        margin-top: -40px;
    }
  
    /* 三级菜单下的 a标签文字颜色 */
    .third-menu li a {
        color: #54afec;
    }
  
    .second-menu li:hover ul {
        display: block;
    }
</style>
  
<body>
    <div id="main">
        <ul class="menu clearfix">
            <li>
                <a href="#">联系我们</a>
            </li>
            <li>
                <a href="#">公司掠影</a>
                <ul class="second-menu clearfix">
                    <li>
                        <a href="">版权声明</a>
                        <ul class="third-menu clearfix">
                            <li>
                                <a href="">1</a>
                            </li>
                            <li>
                                <a href="">2</a>
                            </li>
                            <li>
                                <a href="">3</a>
                            </li>
                        </ul>
                    <li>
                        <a href="">在线留言</a>
                        <ul class="third-menu clearfix">
                            <li>
                                <a href="">1</a>
                            </li>
                            <li>
                                <a href="">2</a>
                            </li>
                            <li>
                                <a href="">3</a>
                            </li>
                        </ul>
                    </li>
                    <li>
                        <a href="">技术支持</a>
                        <ul class="third-menu clearfix">
                            <li>
                                <a href="">1</a>
                            </li>
                            <li>
                                <a href="">2</a>
                            </li>
                            <li>
                                <a href="">3</a>
                            </li>
                        </ul>
                    </li>
            </li>
        </ul>
        </li>
        <li>
            <a href="#">新闻中心</a>
            <ul>
                <li>
                    <a href="">版权声明</a>
                    <ul class="third-menu clearfix">
                        <li>
                            <a href="">1</a>
                        </li>
                        <li>
                            <a href="">2</a>
                        </li>
                        <li>
                            <a href="">3</a>
                        </li>
                    </ul>
                <li>
                    <a href="">在线留言</a>
                    <ul class="third-menu clearfix">
                        <li>
                            <a href="">1</a>
                        </li>
                        <li>
                            <a href="">2</a>
                        </li>
                        <li>
                            <a href="">3</a>
                        </li>
                    </ul>
                </li>
                <li>
                    <a href="">技术支持</a>
                    <ul class="third-menu clearfix">
                        <li>
                            <a href="">1</a>
                        </li>
                        <li>
                            <a href="">2</a>
                        </li>
                        <li>
                            <a href="">3</a>
                        </li>
                    </ul>
                </li>
            </ul>
        </li>
        <li>
            <a href="#">版权声明</a>
        </li>
        <li>
            <a href="#">在线留言</a>
            <ul>
                <li>
                    <a href="">版权声明</a>
                    <ul class="third-menu clearfix">
                        <li>
                            <a href="">1</a>
                        </li>
                        <li>
                            <a href="">2</a>
                        </li>
                        <li>
                            <a href="">3</a>
                        </li>
                    </ul>
                <li>
                    <a href="">在线留言</a>
                    <ul class="third-menu clearfix">
                        <li>
                            <a href="">1</a>
                        </li>
                        <li>
                            <a href="">2</a>
                        </li>
                        <li>
                            <a href="">3</a>
                        </li>
                    </ul>
                </li>
                <li>
                    <a href="">技术支持</a>
                    <ul class="third-menu clearfix">
                        <li>
                            <a href="">1</a>
                        </li>
                        <li>
                            <a href="">2</a>
                        </li>
                        <li>
                            <a href="">3</a>
                        </li>
                    </ul>
                </li>
            </ul>
        </li>
        <li><a href="#">技术支持</a></li>
        </ul>
    </div>
</body>
  
</html>
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