As a webdesigner, I am constantly working around the inconsistencies of browser compatibility. Among the icons of browsers on my quicklaunch bar is a familiar ship’s wheel above a blue right triangle. It is the bain of my existence. There are many workarounds for browsers which do not yet fully support css, but trying to make a site look good in Netscape 4.x is a waste of time and an insult to browsers which promote much less archaic methods of rendering pages.
According to w3schools, Netscape 3 and 4 usage accounts for less than 1% of all web browsers. Although it is still available for download, Netscape 4 and all of it’s predecessors are dead to me.