Does CSS3 work in HTML 4 Transitional?

Question

I am wondering if I can use CSS3 stylesheets in an html page declared as DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN". You know if browsers will accept this ? I know for sure that IE9 does not like the rounded corners:

-webkit-border-top-left-radius: 5px;
-moz-border-radius-topleft: 5px;
border-top-left-radius: 5px;

That is ignored by IE9.

Answer 1

IE9 does support rounded corners even with the doctype transitional. The real question here is, does browsers support CSS3, that you can find out here