test validation page
 jbwyatt.com
To validate you need:
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
                    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    -- FIRST line in file
  2. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    -- FIRST html tag
  3. <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1" />
    -- in <head> section
  4. Valid xhtml and CSS
Validation Information

Valid XHTML 1.0 Transitional     Valid CSS!