I love Cascading Style Sheets (CSS), but I hate the annoying little differences in Internet Exploder 5.x and Netscape 4.×. So far, Opera is the only browser to interpret style sheets 100% correctly. I have yet to see this page on Netscape 6.x or Mozilla, so I cannot speak to their accuracy.

I recommend the following resources for those tweaking their own style sheets: CSS1 reference and a CSS1 lint-style checker. It is a bit out of date, considering that CSS2 has been around for quite a while, but many people are using browsers which still have trouble with CSS1, so I’d recommend sticking to CSS1 for another year.