CSS Hack for Safari

body:last-child:not(:root:root)

green in Safari and red in other browsers.

result

red
WinXP: IE 7, IE 6, Firefox 2, Opera 9, Safari 3
MacOSX: Firefox 2
green
MacOSX: Safari 2

code

#hackSafari{
	background:red;
}
body:last-child:not(:root:root) #hackSafari{
	background:green;
}
©coliss