Learn JavaScript Part 7: getElementById() Method

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <div id="message">
        Hello
    </div>

    <script id="javascript">

    var name = prompt("Enter Your Name","");

    document.getElementById('message').innerHTML += name;

    </script>
</body>
</html>

User Input

Enter Your Name?

Akshay

Output

Hello Akshay