милт,
так?
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
<style>
#wrap {
border: 3px solid blue;
}
p {
background: #FF9900;
height: 100px;
}
</style>
</head>
<body>
<p id="my">Hello</p>
<script>
var el = document.elementFromPoint(20, 20);
$(el).wrap("<div id='wrap'></div>");
</script>
</body>
</html>