HTML5+CSS3 学习笔记 16-CFANZ编程社区

视频资源：https://www.bilibili.com/video/BV14J4114768?from=search&seid=3842566320098741425

视频记录 288-297

伪元素选择器使用场景-字体图标

HTML5+CSS3 学习笔记 16_html5

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>伪元素选择器使用场景-字体图标</title>
    <style>
        @font-face { /*第一步：声明字体*/
            font-family: 'icomoon';
            src: url('fonts/icomoon.eot?1lv3na');
            src: url('fonts/icomoon.eot?1lv3na#iefix') format('embedded-opentype'),
                url('fonts/icomoon.ttf?1lv3na') format('truetype'),
                url('fonts/icomoon.woff?1lv3na') format('woff'),
                url('fonts/icomoon.svg?1lv3na#icomoon') format('svg');
            font-weight: normal;
            font-style: normal;
            font-display: block;
        }
        div {
            position: relative;
            width: 200px;
            height: 35px;
            border: 1px solid red;
        }
        div::after {
            position: absolute; /*子绝父相，不占位置*/
            top: 10px;
            right: 10px;
            font-family: 'icomoon';/*第二步：调用字体*/
            content: '\e91e'; /*必须填写*/
            color: red;
            font-size: 18p;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>

伪元素选择器使用场景2-仿土豆网显示隐藏遮罩案例

<!DOCTYPE html>
<html lang="en">


<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>伪元素选择器使用场景2-仿土豆网显示隐藏遮罩案例</title>
    <style>
        .tudou {
            position: relative;
            width: 444px;
            height: 320px;
            background-color: pink;
            margin: 30px auto;
        }
        .tudou img {
            width: 100%;
            height: 100%;
        }
        .tudou::before {
            content: '';
            /* 隐藏遮罩层 */
            display: none;
            position: absolute; /*加了绝对定位之后，可以指定宽度和高度*/
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, .4) url(images/arr.png) no-repeat center;
        }
        /* 当我们鼠标经过了 土豆这个盒子，就让里面before遮罩层显示出来 */
        .tudou:hover::before { /*重点 ::前后不能有空格*/
            /* 而是显示元素 */
            display: block;
        }
    </style>
</head>
<body>
    <div class="tudou">
        <img src="images/tudou.jpg" alt="">
    </div>
    <div class="tudou">
        <img src="images/tudou.jpg" alt="">
    </div>
    <div class="tudou">
        <img src="images/tudou.jpg" alt="">
    </div>
    <div class="tudou">
        <img src="images/tudou.jpg" alt="">
    </div>
</body>
</html>

伪元素选择器使用场景3：伪元素清除浮动

HTML5+CSS3 学习笔记 16_html5_02

HTML5+CSS3 学习笔记 16_css3_03

CSS盒子模型

HTML5+CSS3 学习笔记 16_html5_04

<!DOCTYPE html>
<html lang="en">
<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>CSS3盒子模型</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;/*重点*/
        }
        div {
            width: 200px;
            height: 200px;
            background-color: pink;
            border: 20px solid red;
            padding: 15px;
            box-sizing: content-box;
        }
        p {
            width: 200px;
            height: 200px;
            background-color: pink;
            border: 20px solid red;
            padding: 15px;
            /* css3 盒子模型  盒子最终的大小就是 width  200 的大小 */
            box-sizing: border-box;
        }
    </style>
</head>
<body>
    <div>
        小猪乔治
    </div>
    <p>
        小猪佩奇
    </p>
</body>
</html>

图片变模糊

HTML5+CSS3 学习笔记 16_html_05

<!DOCTYPE html>
<html lang="en">
<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>图片模糊处理filter</title>
    <style>
        img {
            /* blur是一个函数 小括号里面数值越大，图片越模糊 注意数值要加px单位 */
            filter: blur(15px);
        }
        img:hover {
            filter: blur(0);
        }
    </style>
</head>
<body>
   <img src="images/pink.jpg" alt="">
</body>
</html>

CSS3 calc函数

HTML5+CSS3 学习笔记 16_html_06

<!DOCTYPE html>
<html lang="en">
<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>CSS3属性calc函数</title>
    <style>
        .father {
            width: 300px;
            height: 200px;
            background-color: pink;
        }
        .son {
            /* width: 150px; */
            /* width: calc(150px + 30px); */
            width: calc(100% - 30px); /*100%表示和父盒子一样宽*/
            height: 30px;
            background-color: skyblue;
        }
    </style>
</head>
<body>
    <!-- 需求我们的子盒子宽度永远比父盒子小30像素 -->
    <div class="father">
        <div class="son"></div>
    </div>
</body>
</html>

CSS3 过渡

HTML5+CSS3 学习笔记 16_html_07

HTML5+CSS3 学习笔记 16_css3_08

<!DOCTYPE html>
<html lang="en">
<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>CSS3 过渡效果</title>
    <style>
        div {
            width: 200px;
            height: 100px;
            background-color: pink;
            /* transition: 变化的属性 花费时间 运动曲线 何时开始; */
            /* transition: width .5s ease 0s, height .5s ease 1s; */
            /* 如果想要写多个属性，利用逗号进行分割 */
            /* transition: width .5s, height .5s; */
            /* 如果想要多个属性都变化，属性写all就可以了 */
            /* transition: height .5s ease 1s; */
            /* 谁做过渡，给谁加 */
            transition: all 0.5s; /*重点*/
        }
        div:hover {
            width: 400px;
            height: 200px;
            background-color: skyblue;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>

进度条案例

HTML5+CSS3 学习笔记 16_ico_09

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS3过渡练习-进度条</title>
    <style>
        .bar {
            width: 150px;
            height: 15px;
            border: 1px solid red;
            border-radius: 7px;
            padding: 1px;
        }
        .bar_in {
            width: 50%;
            height: 100%;
            background-color: red;
            /*谁做过渡给谁加*/
            transition: all .7s;
        }
        .bar:hover .bar_in {
            width: 100%;
        }
    </style>
</head>
<body>
    <div class="bar">
        <div class="bar_in"></div>
    </div>
</body>
</html>

狭义的HTML5+CSS3

HTML5+CSS3 学习笔记 16_css3_10

广义的HTML5

HTML5+CSS3 学习笔记 16_ico_11