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</div>$("p:nth-child(2)").css("background-color", "red");
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<div>
<p>W3TR</p>
<p>W3TR</p>
<p>W3TR</p>
</div>
<div>
<span>W3TR</span>
<p>W3TR</p>
<p>W3TR</p>
</div>$("p:nth-child(2)").css("background-color", "red");This Pen doesn't use any external CSS resources.