I recommend that before using any of these hacks that you look at this page and also google the older blog page by David Hammond.
* html - target IE 6 and earlier
*+html - target IE 7 and Opera 9.10 and 9.24
*~html - target IE 7, Opera 9.10 and 9.24 and Opera 9.5 alpha
*+*+html
*~*~html
*:first-child+html - target IE 7
html:first-child - target Opera 9.10 and 9.24
*+html:first-child - target Opera 9.10 and 9.24
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-gb" lang="en">