<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div").children("p").css("background-color","yellow");
});
</script>
</head>
<body>
<p>This is a p element in body.</p>
<div style="border:1px solid;">
<p>This is a p element (child of div).</p>
<h4>This is a h4 element inside the div (child of div).</h4>
<p class="child">This is a p element with class "child" (child of div).</p>
<span>This is a span element (child of div).</span>
<p>This is also a p element (child of div).</p>
</div>
<p>This is also a p element in body.</p>
</body>
</html>