I used several IE 8 hacks, for instance
This should work for all IE versions only according to multiple sources. I have tested this hack on MyBB and XenForo. While with MyBB this hack worked as it should for IE only, with XenForo it worked for all browsers. After investigating the CSS in firebug I saw that XenForo has fixed this CSS to
without the \9.
Does that mean that IE hacks are not possible with XenForo?
PS: I'm talking about hacks, not browser conditionals.