Code
<!DOCTYPE html>
<html>
    <body>
        <form action="demo_form.html">
                Mail-ID: <input type="text" name="mail">
            First name: <input type="text" name="fname"><br><br>
            Last name: <input type="text" name="lname"><br><br>
            <input type="submit" value="Submit" formaction="demo_user.html" value="Submit as admin">
            <input type="submit" formaction="demo_admin.html" value="Submit as admin">
        </form>
    </body>
</html>

Result