<!DOCTYPE html>

<html>
<head>
  <style type="text/css" media="screen">
    body { background-color:silver }
    
    .box {
        height: 100px;
        width: 100px;
        margin: 35px;
        background-color: blue;
        overflow:hidden;
        -webkit-animation: move 400ms alternate infinite linear;
    }

    @-webkit-keyframes move {
        from { -webkit-transform: translate3d(0px, 0px, 0px); }
        to   { -webkit-transform: translate3d(400px, 0px, 0px); }
    }
  </style>
</head>
<body>

    <div id="subframe-box" class="box">
    </div>
    <div id="result"></div>

</body>
</html>