css3有哪些新特性?包含哪些模塊？以下是整理的21個css3新特性：

1.新增選擇器

p:nth-child(n){color: rgba(255, 0, 0, 0.75)}

2.新增偽元素

::before 和 ::after

3.彈性盒模型

display: flex;

4.多列布局

column-count: 5;

5.媒體查詢

@media (max-width: 480px) {.box: {column-count: 1;}}

6.個性化字體

@font-face{font-family: BorderWeb; src:url(BORDERW0.eot);}

7.顏色透明度

color: rgba(255, 0, 0, 0.75);

8.圓角

border-radius: 5px;

9.漸變

background:linear-gradient(red, green, blue);

10.陰影

box-shadow:3px 3px 3px rgba(0, 64, 128, 0.3);

11.倒影

box-reflect: below 2px;

12.文字裝飾

text-stroke-color: red;

13.文字溢出

text-overflow:ellipsis;

14.背景效果

background-size: 100px 100px;

15.邊框效果

border-image:url(bt_blue.png) 0 10;

16.旋轉(zhuǎn)

transform: rotate(20deg);

17.傾斜

transform: skew(150deg, -10deg);

18.位移

transform: translate(20px, 20px);

19.縮放

transform: scale(.5);

20.平滑過渡

transition: all .3s ease-in .1s;

21.動畫

@keyframes anim-1 {50% {border-radius: 50%;}} animation: anim-1 1s;