I know you can target browsers with conditional comments, as explained here in MSDN.
But I just saw one that looked like this <!--[if gte mso 9]>
What does this check for and what (other than browsers) can you check for with conditional comments?
EDIT
Is there any documentation on the conditional comments. What options and what version numbers you can use?
mso = Microsoft Outlook
9 = 2007
It is used for targeting Microsoft Outlook 2007 and later in HTML emails. See this article for details.
This German version of Wikipedia lists the various targets (IE, Microsoft Office, and VML).
http://de.wikipedia.org/wiki/Conditional_Comments (You will need to Google translate)
Also, this post suggests that MS Publisher can also be targeted
http://www.adras.com/can-t-view-page-in-browser.t32980-10-2.html
1. <!--[if IE 8]> <p>Welcome to Internet Explorer 8.</p> <![endif]--> 2. <![if lt IE 8]> <p>Please upgrade to Internet Explorer version 8.</p> <![endif]> // include this too This is <comment>not</comment> Internet Explorer firefox - print - nothing
IE 8 - print - Welcome to Internet Explorer 8.
Firefox - print - Please upgrade to Internet Explorer version 8.
IE 8 - pirnt - nothing but Welcome to Internet Explorer 8. if inclcded.
<!-- comment inner HTML Also while
<! will not comment inner HTML. as in FIREFOX example.
<comment> as i edit in code and run in firefox & IE and look at this too [wiki][1] [1]:en.wikipedia.org/wiki/Conditional_comment