jQuery :nth-of-type() 3rd child selector

<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;">
  <span>This is a span element in div</span>
  <p>The first paragraph in div (and the 3rd child in div, counting from the last child).</p>
  <p>The second 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 (and the 3rd child in this div, counting from the last child).</p>
  <p>The second paragraph in another div.</p>
  <p>The last paragraph in another div.</p>
</div>

<p>The last paragraph in body.</p>