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<!DOCTYPE html>
<html>
<head>
<style>
.div1 *{
display: block;
border: 2px solid lightgrey;
color: black;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("div").children("p.p2").css({"color": "black", "border": "3px solid yellow"});
});
</script>
</head>
<body>
<div class="div1" style="width:500px;">TEXT
<p class="p1">text
<span>span</span>
</p>
<p class="p2">text
<span>span</span>
</p>
<p class="p3">text
<span>span</span>
</p>
</div>
</body>
</html>
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