<!DOCTYPE html>
<html>
<head>
<style>
div
{
100px;
height:100px;
background:blue;
transition:width 2s;
-moz-transition:width 2s; /* Firefox 4 */
-webkit-transition:width 2s; /* Safari and Chrome */
-o-transition:width 2s; /* Opera */
}
div:hover
{
300px;
}
</style>
</head>
<body>
<div></div>
<p>请把鼠标指针移动到蓝色的 div 元素上，就可以看到过渡效果。</p>
<p><b>注释：</b>本例在 Internet Explorer 中无效。</p>
</body>
</html>
http://www.w3school.com.cn/tiy/t.asp?f=css3_transition
<!DOCTYPE html>
<html>
<head>
<style>
div
{
100px;
height:50px;
background:red;
color:white;
font-weight:bold;
transition:width 2s;
-moz-transition:width 2s; /* Firefox 4 */
-webkit-transition:width 2s; /* Safari and Chrome */
-o-transition:width 2s; /* Opera */
}
#div1 {transition-timing-function: cubic-bezier(0,0,0.25,1);}
#div2 {transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {transition-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {transition-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {transition-timing-function: cubic-bezier(0.42,0,0.58,1);}
/* Firefox 4: */
#div1 {-moz-transition-timing-function: cubic-bezier(0,0,0.25,1);}
#div2 {-moz-transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {-moz-transition-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {-moz-transition-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {-moz-transition-timing-function: cubic-bezier(0.42,0,0.58,1);}
/* Safari and Chrome: */
#div1 {-webkit-transition-timing-function: cubic-bezier(0,0,0.25,1);}
#div2 {-webkit-transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {-webkit-transition-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {-webkit-transition-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {-webkit-transition-timing-function: cubic-bezier(0.42,0,0.58,1);}
/* Opera: */
#div1 {-o-transition-timing-function: cubic-bezier(0,0,0.25,1);}
#div2 {-o-transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {-o-transition-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {-o-transition-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {-o-transition-timing-function: cubic-bezier(0.42,0,0.58,1);}
div:hover
{
300px;
}
</style>
</head>
<body>
<div id="div1" style="top:100px">linear</div>
<div id="div2" style="top:150px">ease</div>
<div id="div3" style="top:200px">ease-in</div>
<div id="div4" style="top:250px">ease-out</div>
<div id="div5" style="top:300px">ease-in-out</div>
<p>请把鼠标指针移动到红色的 div 元素上，就可以看到过渡效果。</p>
<p><b>注释：</b>本例在 Internet Explorer 中无效。</p>
</body>
</html>
http://www.w3school.com.cn/tiy/t.asp?f=css3_transition-timing-function3