It is very tempting for a web designer to just use a little browser hack here and there so that the website can use some funky functionality that is perfectly standard but one of the popular browsers has a bug and cannot cope with it.
Do not do it!
Joel has a entertaining (to me anyway) [...]

One encounters more and more Flash websites these days and generally they are more annoying than adding value. Even if the site looks presentable, a common complaint I have is that one cannot cut and paste the text to find out more. For example, an address is given but no map, I [...]