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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("div p:nth-last-of-type(1)").css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>This is a heading in body</h1>
<p>The first paragraph in body.</p>
<p>The second paragraph in body.</p>
<div style="border:1px solid;">
  <p>The first paragraph in div.</p>
  <p>The second paragraph in div.</p>
  <p>The last paragraph in div (and the 1st paragraph in div, counting from the last child).</p>
  <span>This is a span element in div</span>
</div><br>
<div style="border:1px solid;">
  <p>The first paragraph in another div.</p>
  <p>The second paragraph in another div.</p>
  <p>The last paragraph in another div (and the 1st paragraph in this div, counting from the last child).</p>
</div>
<p>The last paragraph in body.</p>
</body>
</html>