<html>
<head>
<script src="../../ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("p:last-child").css("background-color", "yellow");
});
</script>
</head>
<body>
<p>The first paragraph in body.</p>
<div style="border:1px solid;">
<p>The first paragraph in div.</p>
<p>The last paragraph in div.</p>
</div><br>
<div style="border:1px solid;">
<p>The first paragraph in another div.</p>
<p>The last paragraph in another div.</p>
<span>This is a span element.</span>
</div>
<p>The last paragraph in body.</p>
</body>
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</html>