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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $(":hidden").show(3500);
});
</script>
</head>
<body>

<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
<p style="display:none;">This is a hidden paragraph.</p>

<div style="display:none;">This is a hidden div element.</div>

</body>
</html>