Conditional comments

I was just reading on Quirksmode.org about conditional comments. If you don’t already know about this small bit of functionality read on.

Internet Explorer “has been programmed to recognize the special <!--[if IE]> syntax, resolves the if and parses the content of the conditional comment as if it were normal page content.” Since it is enclosed within the same structure as an HTML comment (<!-- -->) all other browsers will see them as normal comments and will ignore them entirely.

<!--[if IE 6]>

Special instructions for IE 6 here

<![endif]-->

What piqued my interest in the first place was this portion of the Adobe Edge newsletter:

<noscript>

<!--[if lt IE 7]><link href="/css/master_import/noscript_ie6.css" type="text/css" rel="stylesheet" /><![endif]-->

<!--[if IE 7]><link href="/css/master_import/noscript_ie7.css" type="text/css" rel="stylesheet" /><![endif]-->

</noscript>

Seems like it might be very useful!

http://www.quirksmode.org/css/condcom.html