jQuery
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
PHPMarvel
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script><script
src="https://code.jquery.com/jquery-3.5.1.min.js"
integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0="
crossorigin="anonymous"></script>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery demo</title>
<script src="https://code.jquery.com/jquery-3.5.0.js"></script>
</head>
<body>
<p>one</p>
<div><p>two</p></div>
<p>three</p>
<script>
$( "div > p" ).css( "border", "1px solid gray" );
</script>
</body>
</html>