JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
<title>Learning jQuery</title>
<script type="text/javascript"  src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
</head>
<body>
<script>
if(typeof jQuery != "undefined" ){
    alert("jquery is installed");
}
else{
    alert("jquery not installed");
}
</script>
</body>
</html>