<!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>
<button>Append</button>
<h1 id="heading">This is a heading.</h1>
<p>This is a first paragraph.</p>
<p>This is a second paragraph.</p>
<p>This is a third paragraph.</p>
</body>
</html>