Microsoft has finally taken the big leap forward we’ve been waiting for ever since they announced their decision to restart IE development back in 2005.
IE9 promises to be an excellent browser. Its CSS support is now at par with that of the other browsers — although each browser still has its specific areas where it performs less. But we cannot in good faith say that IE is behind the others any more.
There are only a very few declarations in my test that IE9 does not support. CSS columns, gradients, text-shadow, resize, and text-stroke are the only ones, and the latter two are WebKit-only.”—QuirksBlog