CSS3 动画
当在 @keyframes 创建动画，把它绑定到一个选择器，否则动画不会有任何效果。
指定至少这两个CSS3的动画属性绑定向一个选择器：
规定动画的名称
规定动画的时长
<style>
div
{
width:100px;
height:100px;
background:red;
animation:myfirst 5s;
-webkit-animation:myfirst 5s; /* Safari and Chrome */
}
@keyframes myfirst
{
from {background:red;}
to {background:yellow;}
}
@-webkit-keyframes myfirst /* Safari and Chrome */
{
from {background:red;}
to {background:yellow;}
}
</style>
</head>
<body>
<div></div>
</body>
当动画为 25% 及 50% 时改变背景色，然后当动画 100% 完成时再次改变
<style>
div
{
width:100px;
height:100px;
background:red;
animation:myfirst 5s;
-moz-animation:myfirst 5s; /* Firefox */
-webkit-animation:myfirst 5s; /* Safari and Chrome */
-o-animation:myfirst 5s; /* Opera */
}
@keyframes myfirst
{
0% {background:red;}
25% {background:yellow;}
50% {background:blue;}
100% {background:green;}
}
@-moz-keyframes myfirst /* Firefox */
{
0% {background:red;}
25% {background:yellow;}
50% {background:blue;}
100% {background:green;}
}
@-webkit-keyframes myfirst /* Safari and Chrome */
{
0% {background:red;}
25% {background:yellow;}
50% {background:blue;}
100% {background:green;}
}
@-o-keyframes myfirst /* Opera */
{
0% {background:red;}
25% {background:yellow;}
50% {background:blue;}
100% {background:green;}
}
</style>
CSS3 多列
1、将 <div> 元素中的文本分为 3 列:
<style>
.newspaper
{
-moz-column-count:3; /* Firefox */
-webkit-column-count:3; /* Safari and Chrome */
column-count:3;
}
</style>
2、多列中列与列间的间隙:
column-gap 属性指定了列与列间的间隙。
<style>
.newspaper
{
-moz-column-count:3; /* Firefox */
-webkit-column-count:3; /* Safari and Chrome */
column-count:3;
-moz-column-gap:40px; /* Firefox */
-webkit-column-gap:40px; /* Safari and Chrome */
column-gap:40px;
}
</style>
3、列边框
<style>
.newspaper
{
column-count:3;
column-gap:40px;
column-rule-style:outset;
column-rule-width:10px;
/* Firefox */
-moz-column-count:3;
-moz-column-gap:40px;
-moz-column-rule-style:outset;
-moz-column-rule-width:10px;
/* Safari and Chrome */
-webkit-column-count:3;
-webkit-column-gap:40px;
-webkit-column-rule-style:outset;
-webkit-column-rule-width:1px;
}
</style>
4、指定元素跨越多少列
<style>
.newspaper
{
column-count:3;
-moz-column-count:3; /* Firefox */
-webkit-column-count:3; /* Safari and Chrome */
}
h2
{
column-span:all;
-webkit-column-span:all; /* Safari and Chrome */
}
</style>
5、指定列的宽度
<style>
.newspaper
{
column-width:100px;
-moz-column-width:100px; /* Firefox */
-webkit-column-width:100px; /* Safari and Chrome */
}
</style>
CSS3 用户界面
1、调整尺寸(Resizing)
<style>
div
{
border:2px solid;
padding:10px 40px;
width:300px;
resize:both;
overflow:auto;
}
</style>
2、外形修饰（outline-offset ）
<style>
div
{
margin:20px;
width:150px;
padding:10px;
height:70px;
border:2px solid black;
outline:2px solid red;
outline-offset:15px;
}
</style>
3、方框大小调整(Box Sizing)
<style>
div.container
{
width:30em;
border:1em solid;
}
div.box
{
box-sizing:border-box;
-moz-box-sizing:border-box; /* Firefox */
width:50%;
border:1em solid red;
float:left;
}
</style>
