DOM Element Using jQuery

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<!DOCTYPE html>
<html>
<head>
<title>Demo Bootstrap V4</title>

<link crossorigin='anonymous' href='https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css' integrity='sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh' rel='stylesheet'/>
<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js' type='text/javascript'></script>
<script crossorigin='anonymous' integrity='sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo' src='https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js'></script>
<script crossorigin='anonymous' integrity='sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6' src='https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js'></script>
</head>
<body>
<div class="container">

<a data-target="#demo_1" data-toggle="collapse" href="#">Open</a>
<ul class="collapse" id="demo_1">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
<li>Item 4</li>
<li>Item 5</li>
</ul>

</div>
</body>
</html>

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