testing style sheets (css) and proper DTD

[Drew, Bill]

I have two questions:

1. Is there a website to test my css style sheet against?
2. What is the DTD code that should be in my web pages to take full
advantage of  CSS?  I had it once but lost it. 

 
Wilfred (Bill) Drew
Associate Librarian, Systems and Reference
SUNY Morrisville College Library
E-mail: mailto:drewwe at morrisville.edu
BillDrew.Net: http://billdrew.net/
Not Just Cows: http://people.morrisville.edu/~drewwe/njc/
Library: http://library.morrisville.edu
Wireless Librarian: http://people.morrisville.edu/~drewwe/wireless/
SUNY Morrisville College: America's Most Wired 2 Year College - 2001, 2000