Lately, I've been wrestling with CSS to make our site more compliant and standards driven. With IE 5.5+ being our target browser, this becomes very interesting. IE is more standards compliant than I would have initially expected, but it's still not even close to Moz which is frustrating. Complicating matters is the lack of good tools. In Moz, I have various bookmarklets that can tell you the styles applied to an object in the page or even open a javascript "shell" you can use to interactively query your page. Most of the bookmarklets don't function in IE, so I have to try to keep my page working in Moz as well, just to be able to use the tools, and while I'm in favor of Moz compatibility, I have no such mandate from management to spend my time that way.