Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
div {
    width: 100px;
    height: 100px;
    background: red;
    position: relative;
    -webkit-animation: mymove 2s 1;  /* Chrome, Safari, Opera */
    animation: mymove 2s 2;
}


/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    from {left: 0px;}

    to {left: 200px;}
}

@keyframes mymove {
    from {left: 0px;}

    to {left: 200px;}
}
</style>
</head>
<body>

<p>Click the "Try it" button to make animation play forever!</p>
<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    document.getElementById("myDIV").style.WebkitAnimationIterationCount = "infinite";  // Code for Chrome, Safari, and Opera
    document.getElementById("myDIV").style.animationIterationCount = "infinite";
}
</script>

<p><strong>Note:</strong> For Firefox users: be sure to click the button BEFORE the animation has finished, if not the change will not have any affect because the animation will not start over once it has finished.</p>
<p><strong>Note:</strong> The animationIterationCount property is currently only supported in Firefox.</p>
<div id="myDIV"></div>

</body>
</html>


Result:
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