We all heavily evangelize the validating of HTML code and think it’s just a given, right? But how about the CSS code?
I think I can honestly say that it is very seldom that I validate the CSS code I write, and I’m not really sure why that is. Laziness? Perhaps. But I think it also comes from the default warnings you get with the online CSS validator, and that I got fed up with them and just stopped validating.
However, Rog wrote a good article some time ago, CSS Validator colour warnings are not errors, which basically explains that most of the warnings are superfluous and if you use CSS 2.1 or CSS 3 features, you can easily use More Options to customize your validation.
Looking at my own behavior, though, I just have to ask:
Do you validate your CSS?