W3C验证CSS是否自动意味着跨浏览器兼容性？

I've finally completed a working version of my first ever CSS-supported site (thanks to some very helpful suggestions on this forum) and have validated the CSS. Before I go out and find (buy?) another machine (I'm a Mac) to check IE on, is it remotely possible that the valid CSS is really truly valid on IE as well as Firefox, Safari that I have used to check my code so far? Thanks, Patrick.I've finally completed a working version of my