"That's all in how you define "effectively." These are styles and effects, not basic functionality. From the first paragraph: "Some (most) of it will not render in all browsers equally (generally those of the IE variety), but <a href="http://forabeautifulweb.com/blog... ... don’t need to look the same in every browser</a>–nor should they. Just because IE6 users can’t see some fancy effect doesn’t mean everybody shouldn’t. Similar to how those watching TV on a standard television will not be able to see HD, users on older browsers need not get the same experience as those on newer browsers as long as they see nothing wrong with the site.""
- Elliot Swan