<!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>Click to fade in/out circles</button><br>
<span id="span1"></span>
<span id="span2"></span>
</body>
</html>