I want to create a form like popup that has a input and a button. When i type in an input Ex.: "good" and click on button it go to the url "good.mydomain.com"
i did this but it doest work
<html>
    <form action="firstname.mydomain.com">
    Go to URL:<br>
    <input type="text" name="firstname" value="">.mydomain.com
    <br>
    <p>
    <input type="submit" value="go">
    </p>
    </form> 
</html>
 
     
    