<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>纯CSS3动画：一棵跳舞的树</title>
<style>
.trunk, .trunk div {
background: #136086;
/*border-radius:$w;*/
width: 100px;
height: 10px;
position: absolute;
margin-left: -10px;
-webkit-animation-name: rot;
animation-name: rot;
-webkit-animation-duration: 2.02s;
animation-duration: 2.02s;
-webkit-animation-iteration-count: infinite;
animation-iteration-count: infinite;
-webkit-animation-direction: alternate;
animation-direction: alternate;
-webkit-transform-origin: 5px 5px;
-ms-transform-origin: 5px 5px;
transform-origin: 5px 5px;
-webkit-animation-timing-function: ease-in-out;
animation-timing-function: ease-in-out;
}
.trunk.trunk, .trunk div.trunk {
bottom: 0;
left: 50%;
-webkit-animation-name: rot-root;
animation-name: rot-root;
-webkit-animation-duration: 2.5s;
animation-duration: 2.5s;
}
.trunk > div, .trunk div > div {
/*opacity:0.9;*/
top: 0;
left: 100px;
-webkit-animation-duration: calc(inherit / 2);
animation-duration: calc(inherit / 2);
/* don't works