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CSS+HTML5的使用方法实例

时间:2021-07-01 10:21:17 帮助过:24人阅读

1.HTML5基础

文档类型

<!DOCTYPE HTML PUBLIC ><!DOCTYPE html>

使用videoaudio标签播放视频和音频

 <video controls>
         <source src="video/video.webm" type="video/webm"/>
         <source src="video/video.mp4" type="video/mp4"/>
     </video>

2.弹性盒子

box-sizing:border-box/content-box(默认值)

3.圆角边框

Border-raduis:左上角,右上角,右下角,左下角。

CSS 其语法的日新月异,让很多以前完成不了的事情,现在可以非常轻松的做到。说几个比较新的强大的 CSS 功能:

  • clip-path

  • shape-outside

shape 的意思是图形,CSS shapes 也就是 CSS 图形的意思,也就是使用 CSS 生成各种图形(圆形、矩形、椭圆、多边形等几何图形)。

CSS3之前,我们能做的只有矩形,四四方方,条条框框。

CSS3

CSS3出来后,我们有了更广阔的施展空间,通过

  • border-radius

  • border

  • transform

  • 伪元素配合

  • gradient 渐变

我们能够作出非常多的几何图形。

除去最常见的矩形,圆形(border-radius),下面稍微列举一些其他几何图形:

//01圆角边的css #circle{
            width: 300px;
            height: 300px;
            border: 1px solid red;
            border-radius: 10px;
            box-shadow: 5px 5px 5px green;
        }<div id="circle">我是圆角边的div</div>//02圆形的css加图片#circleshape{
            width: 300px;
            height: 300px;
            border: 1px solid red;
            border-radius: 150px;
            background: url("img/001.jpg") 0px 0px no-repeat;
            background-size: cover;
            opacity: 0.7;
            transition: all 5s;
        }
        #circleshape:hover{
             transform: rotate(300deg) scale(1.5);
             transition: all 5s linear;
        }<div id="circleshape">我是圆形的div</div>//03半圆形的CSS #halfcircle{
            width: 300px;
            height: 150px;
            border: 1px solid red;
            border-radius: 150px 150px 0px 0px;
            background:linear-gradient(to top,pink,palegreen);
            background:radial-gradient(palegoldenrod,palevioletred);
        }<div id="halfcircle">我是半圆形的div</div>//04四分之一圆形 #halfcircles{
            width: 150px;
            height: 150px;
            border: 1px solid red;
            border-radius: 150px 0px 0px 0px;
        }<div id="halfcircles">我是四分之一圆形的div</div>

 #halfcircless{
            width: 150px;
            height: 150px;
            border: 1px solid red;
            border-radius: 0px 150px 0px 0px;
        }<div id="halfcircless">我是四分之一圆形的div</div>

 #halfcirclesss{
            width: 150px;
            height: 150px;
            border: 1px solid red;
            border-radius: 0px 0px 0px 150px;
        }<div id="halfcirclesss">我是四分之一圆形的div</div>#halfcirclessss{
            width: 150px;
            height: 150px;
            border: 1px solid red;
            border-radius: 0px 0px 150px 0px;
        }<div id="halfcirclessss">我是四分之一圆形的div</div>

 #halfcircl{
            width: 300px;
            height: 150px;
            border: 1px solid red;
            border-radius: 0px 0px 150px 150px;
        }<div id="halfcircl">我是半圆形的div</div>//05:三角形 .traingle {
            width: 0;
            height: 0;
            border-left: 50px solid transparent;
            border-right: 50px solid transparent;
            border-bottom: 100px solid yellowgreen;
        }<div class="traingle ">我的三角形,我是div</div>//06:切角:多重线性渐变实现切角。  .notching {
            width: 40px;
            height: 40px;
            padding: 40px;
            background: linear-gradient(135deg, transparent 15px, yellowgreen 0) top left,
            linear-gradient(-135deg, transparent 15px, yellowgreen 0) top right,
            linear-gradient(-45deg, transparent 15px, yellowgreen 0) bottom right,
            linear-gradient(45deg, transparent 15px, yellowgreen 0) bottom left;
            background-size: 50% 50%;
            background-repeat: no-repeat;

        }<div class="notching">我是切角,我是div</div>//07:椭圆形 .ellipse {
            width: 120px;
            height: 160px;
            background-color: yellowgreen;
            border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
        }<div class="ellipse">我是椭圆形,我是div</div>08:梯形:伪元素加旋转透视实现梯形
 .trapezoid{

            position: relative;

            width: 60px;

            padding: 60px;

        }



        .trapezoid::before{

            content:"";

            position: absolute;

            top: 0; right: 0; bottom: 0; left: 0;

            transform: perspective(20px) scaleY(1.3) rotateX(5deg);

            transform-origin: bottom;

            background: yellowgreen;

        }<div class="trapezoid">我是上面短的梯形,我是div</div>.trapezoids {

            position: relative;

            width: 60px;

            border-top: 60px solid yellowgreen;

            border-left: 40px solid transparent;

            border-right: 40px solid transparent;

        }<div class="trapezoids">我是下面短的梯形,我是div</div>//09.五边形:梯形加上三角形,很容易就组合成一个五边形,这里需要借助一个伪元素实现:.pentagon {

    position: relative;

    width: 60px;

    border-bottom: 60px solid yellowgreen;

    border-left: 40px solid transparent;

    border-right: 40px solid transparent; 

}
.pentagon::before {

    content:"";

    position: absolute;

    top: 60px;

    left: -40px;

    border-top: 60px solid yellowgreen;

    border-left: 70px solid transparent;

    border-right: 70px solid transparent;

}//10六边形看看上面的梯形,如果两个反方向且底边同样大小的梯形,叠加在一起,是不是就能得到一个六边形呢

.pentagon {

    position: relative;

    width: 60px;

    border-bottom: 60px solid yellowgreen;

    border-left: 40px solid transparent;

    border-right: 40px solid transparent;

}

.pentagon::before {

    content: "";

    position: absolute;

    width: 60px;

    height: 0px;

    top: 60px;

    left: -40px;

    border-top: 60px solid yellowgreen;

    border-left: 40px solid transparent;

    border-right: 40px solid transparent;

}//11:八边形六边形都解决了,八边形也不在话下,一个矩形加上两个梯形,可以合成一个八边形。

.octagon {

    position: relative;

    width: 40px;

    height: 100px;

    background: yellowgreen;

}

.octagon::before {

    content: "";

    height: 60px;

    position: absolute;

    top: 0;

    left: 40px;

    border-left: 30px solid yellowgreen;

    border-top: 20px solid transparent;

    border-bottom: 20px solid transparent;

}

.octagon::after {

    content: "";

    height: 60px;

    position: absolute;

    top: 0;

    left: -30px;

    border-right: 30px solid yellowgreen;

    border-top: 20px solid transparent;

    border-bottom: 20px solid transparent;

}//12:五角星好的,探索完多边形,我们继续探索X角星。

先来看看五角星,要怎么实现呢?当然是直接打出来啦 -- ★☆

.star {

   margin: 50px 0;

   position: relative;

   width: 0;

   border-right: 100px solid transparent;

   border-bottom: 70px  solid yellowgreen;

   border-left: 100px solid transparent;

   transform: rotate(35deg) scale(.6);

}

.star:before {

    content: '';

    position: absolute;

    border-bottom: 80px solid yellowgreen;

    border-left: 30px solid transparent;

    border-right: 30px solid transparent;

    top: -45px;

    left: -65px;

    transform: rotate(-35deg);

}

.star:after {

    content: '';

    position: absolute;

    top: 3px;

    left: -105px;

    border-right: 100px solid transparent;

    border-bottom: 70px solid yellowgreen;

    border-left: 100px solid transparent;

    transform: rotate(-70deg);

}//12:六角星六角星呢?想象一下,一个向上的三角形 ▲,叠加上一个向下的三角形 ▼,就可以得到一个六边形:

.sixstar {

    position: relative;

    width: 0;

    border-left: 50px solid transparent;

    border-right: 50px solid transparent;

    border-bottom: 100px solid yellowgreen;

}

.sixstar:after {

    content: "";

    position: absolute;

    border-left: 50px solid transparent;

    border-right: 50px solid transparent;

    border-top: 100px solid yellowgreen;

    top: 30px;

    left: -50px;

}//13:八角星八角星呢?八个角那么多呢。其实使用两个矩形进行旋转拼接就可以了。

.eightstar {

    position: relative;

    width: 100px;

    height: 100px;

    background-color: yellowgreen;

    transform: rotate(30deg);

}

 

.eightstar::before {

    content: "";

    position: absolute;

    top: 0;

    left: 0;

    width: 100px;

    height: 100px;

    transform: rotate(45deg);

    background-color: yellowgreen;

}//14:十二角星好。最后多角星再来一个十二级角星。在八角星的基础上,再增加一个矩形,就能得到十二角啦。也就是要过第一个伪元素。

.twelvestar {

    position: relative;

    width: 100px;

    height: 100px;

    margin-bottom: 100px!important;

    background-color: yellowgreen;

    transform: rotate(30deg);

}

 

.twelvestar::before {

    content: "";

    position: absolute;

    top: 0;

    left: 0;

    width: 100px;

    height: 100px;

    transform: rotate(30deg);

    background-color: yellowgreen;

}

 

.twelvestar::after {

    content: "";

    position: absolute;

    top: 0;

    left: 0;

    width: 100px;

    height: 100px;

    transform: rotate(60deg);

    background-color: yellowgreen;

}

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