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W3C  CSS code validator 

Web Design Group CSS Check 
 
 
Non Conforming Browsers(-.5% of market):
  Opera: Version 3.5 & earlier
  Netscape Navigator: 3.x and earlier
  Internet Explorer: 2.x and earlier

Netscape 4.x - Unstable use of CSS
Work arounds for Netscape 4.x(Unstable)
For complete CSS Block: Use code that 4.x ignores.
Instead of this:
 <link rel="stylesheet" type="text/css" href="ourcsspg.css" />
Use:
 <style type="text/css">
  @import "ourcsspg.css";
 </style>
Or:  
 <link rel="stylesheet" type="text/css" href="corpstyle.css" media="all" />

 

 
  

 

 XML DOCTYPE Switching Bug
Internet Explorer 6
  Can't use <?xml version="1.0" encoding="utf-8" ?>

The following works:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 <title>Page Title Here</title>
 <meta http-equiv="Content-Type"
   content="text/html; charset=utf-8" />

Or:  Omit the declaration