CSS if statements... is it right?

Question

I'm new with the conditional CSS. My question is, is it right to use it for dealing with cross-browsers issues?

For example:

#header
{
    [if IE 7] width: 600px;
    [if Webkit] width:300px;    
}

---

Editor's note: OP is most likely using this: http://www.conditional-css.com/

Answer 1

Use conditional statements for the actual CSS files (or classes) but on the html.

Like this for example:

<!--[if lte IE 6]>
<link href="css/layoutIE6.css" rel="stylesheet" type="text/css" />
<![endif]-->

This is written on the html file, not the CSS file!

The format you posted I think doesn't actually work and I bet it doesn't validate so it is not standard.