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 name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ol > li {
            color: red;
        }
    </style>
</head>
<body>
   <ol>
        <li>合肥</li>
        <li>淮北
            <ol>
                <li>相山区</li>
                <li>濉溪县</li>
                <li>烈山区</li>
            </ol>
        </li>
        <li>巢湖</li>
    </ol>
</body>

</html>

你好，老师。我这个子代选择器的书写li标签里嵌套的ol li标签为什么也生效了，能帮忙看看哪里出了问题吗

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS选择器 361楼

你好老师，用html构建表格给table一个border属性外边框和单元格都会自动显示边框，而用css来加样式的时候，必须table 和td同时给一个border属性，这样外边框和单元格才会都有边框

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS常用属性 362楼

你好老师，css的表格属性里折叠边框border-collapse属性是不是相当于表格属性里的callspacing padding属性相当于callpadding

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS常用属性 363楼

你好，表格属性里的表格边框border属性table,td{border:1px solid black }里面的solid black 什么意思啊，视频中直接就书写也不对其进行解释

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS常用属性 364楼

老师，一张图片上要呈现出文字，该怎么弄？类似这种。

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS3新特性 365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>
    <link rel="stylesheet" href="./iconfont.css">
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body{
            background-color: #f1f1f1;
        }
        .slide{
            width: 234px;
            height: 420px;
            background-color: rgba(105,101,101,0.6);
            padding: 20px 0;
            margin: 100px;
            position: relative;
        }
        .slide ul{
            list-style: none;
        }
        .slide ul li{
            width: 100%;
            height: 42px;
            line-height: 42px;
            text-align: left;
            padding-left: 30px;
            box-sizing: border-box;
        }
        .slide ul li:hover{
            background-color: #ff6700;
           
        }
        .slide ul li a{
            display: inline-block;
            text-decoration: none;          
            color: #fff;
           
        }
       
        .slide .iconfont{
            display: inline-block;
            font-size: 24px;
            color: #fff;
            position: absolute;
            right: 10px;
        }
        .slide-list{
            width: 992px;
            height: 460px;
            background-color: #fff;
            position: absolute;
            top: 0;
            left: 234px;
            border: 1px solid #e0e0e0;
            border-left:none ;
            box-sizing: border-box;
            box-shadow: 0 4px 16px rgba(0,0,0,0.18);
            display: none;
            overflow: hidden;
            clear: both;
        }
        /* 鼠标滑动到li标签上，对应的div出现 */
        .slide ul li:hover>.slide-list{
            display: block;
        }
        .slide-list .text{
            display: block;
            width: 208px;
            height: 70px;
            line-height: 70px;
            /* background-color: red;     */
            float: left;
            margin-left: 30px;
            margin-top: 7px;
            font-size:normal;
        }
        .slide-list .text:hover>i{
            color: #ff6700;

        }
        .slide-list .text img{
            display: inline-block;
            /* 垂直对齐方式 */
            vertical-align: middle;
           
           
        }
        .slide-list .text i{
            font-size:normal;
            display: inline-block;
            color:black;
            font-size: 16px;  
        }
    </style>
</head>
<body>

    <div class="slide">
        <ul>
            <li>
                <a href="#">手机</a>
                <span class="iconfont icon-jiantou"></span>
                <div class="slide-list">
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" >
                        <i>Redmi K50 Pro</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 12X.webp" alt="">
                        <i>Xiaomi 12X</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi Civi.webp" alt="">
                        <i>Xiaomi Civi</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 10S.webp" alt="">
                        <i>Xiaomi 10S</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" alt="">
                        <i>Redmi K50</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" >
                        <i>Redmi K50 Pro</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 12X.webp" alt="">
                        <i>Xiaomi 12X</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi Civi.webp" alt="">
                        <i>Xiaomi Civi</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 10S.webp" alt="">
                        <i>Xiaomi 10S</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" alt="">
                        <i>Redmi K50</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" >
                        <i>Redmi K50 Pro</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 12X.webp" alt="">
                        <i>Xiaomi 12X</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi Civi.webp" alt="">
                        <i>Xiaomi Civi</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 10S.webp" alt="">
                        <i>Xiaomi 10S</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" alt="">
                        <i>Redmi K50</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" >
                        <i>Redmi K50 Pro</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 12X.webp" alt="">
                        <i>Xiaomi 12X</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi Civi.webp" alt="">
                        <i>Xiaomi Civi</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 10S.webp" alt="">
                        <i>Xiaomi 10S</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" alt="">
                        <i>Redmi K50</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" >
                        <i>Redmi K50 Pro</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 12X.webp" alt="">
                        <i>Xiaomi 12X</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi Civi.webp" alt="">
                        <i>Xiaomi Civi</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 10S.webp" alt="">
                        <i>Xiaomi 10S</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" alt="">
                        <i>Redmi K50</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Redmi K50 Pro.webp" >
                        <i>Redmi K50 Pro</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 12X.webp" alt="">
                        <i>Xiaomi 12X</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi Civi.webp" alt="">
                        <i>Xiaomi Civi</i>
                    </a>
                    <a  class="text" href="#">
                        <img src="./Xiaomi 10S.webp" alt="">
                        <i>Xiaomi 10S</i>
                    </a>
                   
                </div>
            </li>
            <li>
                <a href="#">电视</a>
                <span class="iconfont icon-jiantou"></span>
                <div class="slide-list">小米2</div>
            </li>
        </ul>
    </div>
   
</body>
</html>

为什么这个字体我设置的normal但是还是斜体

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS应用技巧 366楼

你好，老师 option和input标签里面必须书写value属性吗？书写和不书写的区别又是什么呢？

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 367楼

为什么submit和reset属性后面不需要添加name

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 368楼

input的name属性是不是随便给一个值都行，只要给取个名字就可以，还是讲name属性的属性值必须是有要求的

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 369楼

你好，老师。form标签里书写的内容是不是不会自动换行

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 370楼

自定义列表能不能用无序列表里嵌套无序列表来实现呢

WEB前端全系列/第一阶段：HTML5+CSS3模块/HTML5基础元素 371楼

超链接href属性跳转网站地址前面一定要加https://吗

WEB前端全系列/第一阶段：HTML5+CSS3模块/HTML5基础元素 372楼

注释不是有快捷键吗，怎么讲那么复杂

WEB前端全系列/第一阶段：HTML5+CSS3模块/前端入门与基础知识 373楼

老师，旋转，缩放，移动这些效果并没有设置浮动，但为什么一个块元素可以遮盖下面的块元素，正常情况下不是会挤下去吗？

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS3新特性 374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>
    <!--  盒子模型组成部分
    
            1：内容区域 content
                1：默认大小，盒子大小由内容撑开
                2：手动设置，width和height属性完成对盒子大小的设计
            2：内边距Padding
                1：边框与内容之间的空白就是内边距
                2：填充值：PX值（推荐）与百分比
                3：top|bottom|right|left
            3：边框Border
            4：外边距Margin
        -->
    <!-- s实操细节
            1：宽度设置百分比生效
            2：高度设计百分比不生效，高度一般设置PX值
     -->
    <style>
        * {
            margin: 0 auto;
            padding: 0;
        }

        ul {
            list-style: none;
            height: 50px;
            line-height: 50px;
            background-color: black;
        }

        ul li {
            float: left;      
        }
        ul li a {

            color: aliceblue;
            text-decoration: none;
            /*去除超链接下划线*/
            padding: 5px;

        }
        nav{
            height: 50px;
            width: 100%;
            background-color: black;
            padding: 5px;

        }
        nav a{
            line-height: 50px;
            color: aliceblue;
            text-decoration: none;
        }
    </style>
</head>

<body>
    <nav>
        <a href="#">首页</a>
        <a href="#">手机</a>
        <a href="#">家电</a>
        <a href="#">配件</a>
        <a href="#">生活</a>
        <a href="#">服务</a>
        <a href="#">社区</a>
    </nav>
    <br>
    <ul>
        <li><a href="#">首页</a></li>
        <li><a href="#">手机</a></li>
        <li><a href="#">家电</a></li>
        <li><a href="#">配件</a></li>
        <li><a href="#">生活</a></li>
        <li><a href="#">服务</a></li>
        <li><a href="#">社区</a></li>
    </ul>


</body>

</html>

老师，能用nav标签是不是就不用费劲写ul li标签了

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS盒子模型 375楼

同学您好