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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("div p").first().css("background-color", "yellow");
});
</script>
</head>
<body>

<h1>Welcome to My Homepage</h1>

<div style="border:1px solid black">
  <p>This is a paragraph in a div.</p>
  <p>This is a paragraph in a div.</p>
</div><br>

<div style="border:1px solid black">
  <p>This is a paragraph in another div.</p>
  <p>This is a paragraph in another div.</p>
</div>

<p>This is also a paragraph.</p>

</body>
</html>