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<!DOCTYPE html>
<html>
<script src='https://code.jquery.com/jquery-3.5.1.slim.min.js'
integrity='sha256-4+XzXVhsDmqanXGHaHvgh1gMQKX40OUvDEBTu8JcmNs='
crossorigin='anonymous'></script>
<body>
<h1>Introduction</h1>
<div>
<h1>About HTML</h1>
<h1>About CSS</h1>
</div>
<h1>About JavaScript</h1>
<script>$('div > h1').css('background-color', '#436e58')</script>
</body>
</html>
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