html

<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<script language="JavaScript"></script>
<script src="main.js"></script>

</head>

<body>
        <form>
            Username: <input type="text" id="user"><br><br>
            Password: <input type="text" id="pass"><br><br>
            <input type="button" onClick="printOutput()" value="Go">
        </form>

        <p id="outputUser">You enter username: </p>
        <p id="outputPass">You enter password: </p>

</body>

</html>