1.HTML5Basics
Document Type
nbsp;HTML PUBLIC >nbsp;html>
Use video and audio tags play video and audio
<video> <source></source> <source></source> </video>
2.flexible box
box-sizing :border-box/content-box(Default value)
3. Rounded border
Border-raduis:Upper left corner, upper right corner, lower right corner, lower left corner.
##CSS’s syntax is changing with each passing day, making many things that could not be done before. Now it can be done very easily. Let’s talk about a few relatively new and powerful CSS functions:
- clip-path
- shape-outside
- shape means graphics, and CSS shapes means CSS graphics, which means using CSS to generate various shapes (circles, rectangles, ellipses, polygons and other geometric shapes).
Before CSS3, all we could do were rectangles, boxes, and boxes.
CSS3
After CSS3 came out, we have a broader space for display. Through
- border-radius
- border
- transform
- gradient gradient
- we can create a lot of geometric shapes.
Except for the most common rectangles and circles (
border-radius), here are some other geometric shapes:
//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>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>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>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>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>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>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>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>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>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>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>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>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>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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