站長(zhǎng)資訊網(wǎng)1.HTML5基礎(chǔ)
文檔類(lèi)型
<!DOCTYPE HTML PUBLIC ><!DOCTYPE html>
使用video和audio標(biāo)簽播放視頻和音頻
<video controls> <source src="video/video.webm" type="video/webm"/> <source src="video/video.mp4" type="video/mp4"/> </video>
2.彈性盒子
box-sizing:border-box/content-box(默認(rèn)值)
3.圓角邊框
Border-raduis:左上角，右上角，右下角，左下角。
CSS 其語(yǔ)法的日新月異，讓很多以前完成不了的事情，現(xiàn)在可以非常輕松的做到。說(shuō)幾個(gè)比較新的強(qiáng)大的 CSS 功能：
-
clip-path
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shape-outside
shape 的意思是圖形，CSS shapes 也就是 CSS 圖形的意思，也就是使用 CSS 生成各種圖形（圓形、矩形、橢圓、多邊形等幾何圖形）。
CSS3之前，我們能做的只有矩形，四四方方，條條框框。
CSS3
CSS3出來(lái)后，我們有了更廣闊的施展空間，通過(guò)
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border-radius -
border -
transform -
偽元素配合
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gradient 漸變
我們能夠作出非常多的幾何圖形。
除去最常見(jiàn)的矩形，圓形（border-radius），下面稍微列舉一些其他幾何圖形：
//01圓角邊的css #circle{ width: 300px; height: 300px; border: 1px solid red; border-radius: 10px; box-shadow: 5px 5px 5px green; }<div id="circle">我是圓角邊的div</div>//02圓形的css加圖片#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">我是圓形的div</div>//03半圓形的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">我是半圓形的div</div>//04四分之一圓形 #halfcircles{ width: 150px; height: 150px; border: 1px solid red; border-radius: 150px 0px 0px 0px; }<div id="halfcircles">我是四分之一圓形的div</div> #halfcircless{ width: 150px; height: 150px; border: 1px solid red; border-radius: 0px 150px 0px 0px; }<div id="halfcircless">我是四分之一圓形的div</div> #halfcirclesss{ width: 150px; height: 150px; border: 1px solid red; border-radius: 0px 0px 0px 150px; }<div id="halfcirclesss">我是四分之一圓形的div</div>#halfcirclessss{ width: 150px; height: 150px; border: 1px solid red; border-radius: 0px 0px 150px 0px; }<div id="halfcirclessss">我是四分之一圓形的div</div> #halfcircl{ width: 300px; height: 150px; border: 1px solid red; border-radius: 0px 0px 150px 150px; }<div id="halfcircl">我是半圓形的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:多重線(xiàn)性漸變實(shí)現(xiàn)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：橢圓形 .ellipse { width: 120px; height: 160px; background-color: yellowgreen; border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%; }<div class="ellipse">我是橢圓形，我是div</div>08：梯形：偽元素加旋轉(zhuǎn)透視實(shí)現(xiàn)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>//09.五邊形:梯形加上三角形，很容易就組合成一個(gè)五邊形，這里需要借助一個(gè)偽元素實(shí)現(xiàn)：.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; }//10六邊形看看上面的梯形，如果兩個(gè)反方向且底邊同樣大小的梯形，疊加在一起，是不是就能得到一個(gè)六邊形呢 .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; }//11：八邊形六邊形都解決了，八邊形也不在話(huà)下，一個(gè)矩形加上兩個(gè)梯形，可以合成一個(gè)八邊形。 .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，探索完多邊形，我們繼續(xù)探索X角星。 先來(lái)看看五角星，要怎么實(shí)現(xiàn)呢？當(dāng)然是直接打出來(lái)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，一個(gè)向上的三角形 ▲，疊加上一個(gè)向下的三角形 ▼，就可以得到一個(gè)六邊形： .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？八個(gè)角那么多呢。其實(shí)使用兩個(gè)矩形進(jìn)行旋轉(zhuǎn)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。最后多角星再來(lái)一個(gè)十二級(jí)角星。在八角星的基礎(chǔ)上，再增加一個(gè)矩形，就能得到十二角啦。也就是要過(guò)第一個(gè)偽元素。 .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; }
