CSS3 Support for Windows Phone 7 IE

I would like to know what sort of CSS3 transformation properties are Hardware Accelerated in the latest IE in Windows Phone 7 Mango update. This informat开发者_如何转开发ion seems nowhere to be found.

There isn't much around this, but I imagine it would only be the computationally intensive transformations if anything: out of the list of CSS3 features supported mentioned on the IE9 Mobile article here, maybe 2D Transforms?

In any case, why would information on which CSS3 transforms are Hardware Accelerated be useful? It seems kind of weird/counterintuitive to be designing your CSS based on whether it will be accelerated or not?