CSS Hacking

IE
Any version of IE
lt IE version
Versions less than version
lte IE version
Versions less than or equal to version
IE version
Only version version
gte IE version
Versions greater than or equal to version
gt IE version
Versions greater than version

IE 6 and below
* html {}
IE 7 and below
*:first-child+html {} * html {}
IE 7 only
*:first-child+html {}
IE 7 and modern browsers only
html>body {}
Modern browsers only (not IE 7)
html>/**/body {}
Recent Opera versions 9 and below
html:first-child {}