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>