That is beyond the scope of CSS, but it is quite simple to do with JQuery
$(document).ready(function() {/*You code here*/ }
Or read more about it here => http://api.jquery.com/ready/
Place your animation code in a class, lets say .animation
Then call that class on the element you wish to animate using JQuery .addclass() (http://api.jquery.com/addClass/)
Something like this
<script type="text/javascript">
$(document).ready(function() {
$("#element-to-animate").addClass("animation");
});
</script>
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