I'm getting warnings about CSS3.0 properties like text-overflow. Is there a way to validate against 3.0?
Apparently, you can define your own Visual Studio Intellisense schema for CSS. I’m not sure if VS will then validate against that, or only use it for code completion.
Might be worth making a minimal one and seeing if it gets used for validation.
Custom CSS Intellisense Schema in Visual Studio 2005 and 2008
I don’t know of an easy way to validate against CSS 3 yet though. CSS 3 is a large, modular spec, and most of it is very much still in flux, despite some decent browser support for some properties.
I do not believe so. But you can turn the validation off if you want. Go to Tools > Options. Expand Text Editor > HTML > Validation. This screen shows all the different validation targets. Uncheck Show Errors if you want to turn the validation off.