مشاهده و تمرین روی کد ها

<!DOCTYPE html>
<html>
<head>
<style> 
.div {
    width: 100px;
    height: 100px;
    background-color: red;
    position: relative;
    -webkit-animation: myfirst 5s linear 2s infinite alternate; /* Safari 4.0 - 8.0 */
    animation: myfirst 5s linear 2s infinite alternate;
}

/* Safari 4.0 - 8.0 */
@-webkit-keyframes myfirst {
    0%   {background-color:red; left:0px; top:0px;}
    25%  {background-color:yellow; left:200px; top:0px;}
    50%  {background-color:blue; left:200px; top:200px;}
    75%  {background-color:green; left:0px; top:200px;}
    100% {background-color:red; left:0px; top:0px;}
}

/* Standard syntax */
@keyframes myfirst {
    0%   {background-color:red; left:0px; top:0px;}
    25%  {background-color:yellow; left:200px; top:0px;}
    50%  {background-color:blue; left:200px; top:200px;}
    75%  {background-color:green; left:0px; top:200px;}
    100% {background-color:red; left:0px; top:0px;}
}
</style>
</head>
<body>

<p><b>Note:</b> This example does not work in Internet Explorer 9 and earlier versions.</p>

<div class="div"></div>

</body>
</html>

ویژگی animation