As far as I can tell the CSS pseudo class of :hover is not supported. Can anyone confirm this?

Advanced PDF isn't HTML so you're gonna get a lot of weirdnesses trying to use default CSS. If it doesn't work and you know its valid, its not supported and you have to find another way to do it.

the properties supported are determined entirely by BFO, and vary considerably by tag: https://bfo.com/products/report/docs/tags/ If it’s a supported tag property, based on the BFO documentation, then it should work in the stylesheet as well, though there are some cases where only inline styles seem to have the desired effect.

Another layer to the madness is that you also have to look at the version NS is using for freemarker and even then it may/may not be supported. I think they use some kind of customized version if im not mistaken.

Any idea how to find the version of freemarker NS uses? Definitely some functionality I want to get into using

yeah there's a freemarker tag for it but I don't know if off the top of my head. Its on the freemarker site if you search for version

According to this: https://freemarker.apache.org/docs/ref_specvar.html, it’s

.version