<!--[if lt IE 9]>
This is less then IE9
ELSE
this is all browsers: firefox, chrome, etc.
<![endif]-->
How do I do this in my HTML? I want to do an "else" ...
You're not looking for an else, you're looking for <![if !IE]> <something or other> <!--[endif]>
(note that this is not a comment).
<!--[if IE]>
You're using IE!
<![endif]-->
<![if !IE]>
You're using something else!
<![endif]>
You can find documentation on the conditional comments here.