step（）动画

<style type="text/css">
.hi {
    width: 50px;
    height: 72px;
    background-image: url("http://s.cdpn.io/79/sprite-steps.png");

    -webkit-animation: play .8s steps(10) infinite;
       -moz-animation: play .8s steps(10) infinite;
        -ms-animation: play .8s steps(10) infinite;
         -o-animation: play .8s steps(10) infinite;
            animation: play .8s steps(10) infinite;
}

@-webkit-keyframes play {
   from { background-position:    0px; }
     to { background-position: -500px; }
}

@-moz-keyframes play {
   from { background-position:    0px; }
     to { background-position: -500px; }
}

@-ms-keyframes play {
   from { background-position:    0px; }
     to { background-position: -500px; }
}

@-o-keyframes play {
   from { background-position:    0px; }
     to { background-position: -500px; }
}

@keyframes play {
   from { background-position:    0px; }
     to { background-position: -500px; }
}
</style>
</head>
<body>
<img src="http://s.cdpn.io/79/sprite-steps.png" />
<div class="hi"></div>
</body>