有效沟通问答-【官方】百战程序员_IT在线教育培训机构

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .nav{
            width: 100%;
            height: 60px;
            background-color: black;
        }

        .nav ul{
            overflow: hidden;
            clear: both;
        }

        .nav ul li{
            list-style: none;
            float: left;
            padding: 20px 25px;
        }

        .nav ul li a{
            color: aqua;
            text-decoration: none;
            font-size: 30px;
        }
        .box{
            width: 100%;
            height: 300px;
            position: absolute;
            left: 0%;
            display:none;
        }

        .nav li:hover>.box{
            display: block;
        }


    </style>

</head>
<body>
   
    <div class="nav">
        <ul>
            <li><a href="#">首页</a>    
            <div class="box" style="background-color: red;"></div><!--这个就是下拉列代表的容器-->
        </li>
            <li><a href="#">手机</a>    
            <div class="box" style="background-color: gold;"></div>
        </li>


            <li><a href="#">配件</a>    
            <div class="box" style="background-color: green;"></div>
        </li>

            <li><a href="#">电脑</a>    
            <div class="box" style="background-color: blanchedalmond;"></div>
        </li>
            <li><a href="#">手表</a>    
            <div class="box" style="background-color: blue;"></div>
        </li>
        </ul>
    </div>

</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/浮动与定位 81楼

老师，submit那里的value是可以不用写对吗

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 82楼

老师，为什么我的显示的提示是这句话

我是这样写的

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 83楼

视频中为什么要加bottom？

不是没有position属性吗。

WEB前端全系列/第一阶段：HTML5+CSS3模块/浮动与定位 84楼

span标签不是行内元素吗，为啥还设置宽高？

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS选择器 85楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
  <style>
.box{
    width: 200px;
    height: 200px;
    background: red;
    padding: 50px;
    border:20px solid green;
    margin: 50px;
    box-sizing: border-box;
}

  </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS盒子模型 86楼

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .square {
            width: 400px;
            height: 400px;
        }
        .left{
            float: left;
            width: 200px;
            height:200px;
            background-color: cyan;
        }
        .right {
            float: left;
            width: 200px;
            height: 400px;
            background-color: chocolate;
        }
        .top {
            width: 200px;
            height: 200px;
            background-color: antiquewhite;
        }

        .bottom {
            width: 200px;
            height: 200px;
            background-color: aquamarine;
        }

       
    </style>

</head>

<body>

    <div class="square">
        <div class="left">
            <div class="top"></div>
            <div class="bottom"></div>
        </div>
        <div class="right"></div>
    </div>
   
   

</body>

</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/初识CSS 87楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .square{
            width: 600px;
            height: 600px;
            background-color: antiquewhite;
        }
        .left{
            float: left;
            width: 200px;
            height: 600px;
            background-color: pink;
        }
        .right{
            float: right;
            width: 400px;
            height: 600px;
            background-color: green;
        }
        .top{
            width: 400px;
            height: 300px;
            background-color: springgreen;
        }
        .zuo{
            float: left;
            width: 200px;
            height: 300px;
            background-color: blue;
        }
        .you{
            float: right;
            width: 200px;
            height: 300px;
            background-color: chocolate;
        }
    </style>

</head>
<body>
   
    <div class="square">
        <div class="left"></div>
        <div class="right">
            <div class="top"></div>
            <div class="bottom">
                <div class="zuo"></div>
                <div class="you"></div>
            </div>
        </div>
    </div>

</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/初识CSS 88楼

这个注释标签

中间必须要有空格吗？

WEB前端全系列/第一阶段：HTML5+CSS3模块/前端入门与基础知识 89楼

比如说“你好，很高兴见到你”这段话，我想要加粗的同时增加斜体效果，标签要如何使用

WEB前端全系列/第一阶段：HTML5+CSS3模块/HTML5基础元素 90楼

同学您好