I use doctype in all my seam pages and have no problems (FF1.5, 2.0, IE6). My seam apps use myfaces, so maybe it is a JSF-RI issue of not ripping out the doctypes. So Toms' observation is correct (since he also used myfaces) If I do not have doctypes in my pages, my eclipse plugin (exadel) cannot validate the pages, so I definately want the docstypes in. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4008006#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...