i'm not using
I'm only using this dtd as a first thing in a page? which has no problem to render strict mode.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
and checked quirks mode with this site http://vesa.piittinen.name/doctype/
(i can't give link of site which i'm working)
In IE 6 it shows almost standards mode. and in FF it shows full standards mode
Should i change my doctype to get same rendering in all browser?