<!DOCTYPE html>
<html>
<head>
<title>Learning jQuery</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
</head>
<body>
<h1>Demo Text</h1>
<p>Just a sample text...</p>
<p class="hint"><strong>Tip:</strong> Lorem Ipsum is dummy text.</p>
<button type="button">Add Class</button>
</body>
</html>