Does anyone know authoritatively if the CSS feature set for IE9 is frozen as of IE9 Beta?
I'm particularly wondering/disappointed about CSS multi-column.
What I can't find on the Microsoft site is a current list (for IE9) of CSS vendor extensions with the -ms- prefix. Might be some of the basic multi-column features implemented there.
Check QuirksMode, or more specifically, the IE9 column.
I know it's not from the horse's mouth, but it may be useful.
Microsoft also have a similar table. However, they do note...
All columns marked "Internet Explorer 9 Beta" are preliminary content. They may be changed substantially prior to commercial release of the software described herein.
As for if the CSS support is set, I'm not sure, and if they haven't said so, then probably only the developers will know.
As of now, they state...
Internet Explorer does not support any of the CSS3 multi-column layout properties.
Thanks Alex. I guess columns is probably not happening in IE9. The thing about the MS page you cite is that it doesn't have any of the -ms- properties. Maybe all the IE8-era ones are official now without vendor prefix? I'm too lazy to compare... Colum