1.HTML5基础

文档类型

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">



Transitional:过渡类型

Strict:严格类型

FrameSet:框架类型

<!DOCTYPE html>

使用video和audio标签播放视频和音频

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

 

 

文档类型

2.弹性盒子

 

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

 

 

HTML4的开头
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">



Transitional:过渡类型

Strict:严格类型

FrameSet:框架类型

HTML5的开头
<!DOCTYPE html>

3.圆角边框

 

 Border-raduis:左上角,右上角,右下角,左下角。

 

永利开户送38元体验金 2

 

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;

}

永利开户送38元体验金 3

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使用video和audio标签播放视频和音频

永利开户送38元体验金 1

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

  

永利开户送38元体验金, 

 

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。

 

永利开户送38元体验金 2

 

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:

永利开户送38元体验金 13

//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;

}

永利开户送38元体验金 14

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