insert Properties

<html>  
<head>  
    <meta charset="utf-8">  
    <title>JavaScript insertBefore() method</title>  
</head>  
<body>  
    <ul id="weeks">  
                      <li>Sunday</li>  
                      <li>Monday</li>  
                      <li>Wednesday</li>  
        <li>Thursday</li>  
        <li>Friday</li>  
        <li>Saturday</li>  
    </ul>  
    <script>  
        let x = document.getElementById('weeks');  
        let add = document.createElement('li');  
        add.textContent = 'Tuesday';  
         //as we need to insert before 4th element  
        weeks.insertBefore(add, x.childNodes[4]);  
    </script>  
</body>  
</html>