Forum Moderators: phranque
A while ago, I downloaded a program called Browserola (not sure of the URL) that can emulate browsers from 1.0 through to 4.0. I'm not sure how accurate the emulation is, as I think it just strips out tags and attributes that a particular browser version doesn't understand.
Aside from that, the most commonly used browsers are free, so you may as well download them all. Several versions of Netscape can co-exist together peacefully, but Windoze only allows one version of MSIE to be installed. While someone around here probably knows a way around the MSIE limitation, I just install different versions of MSIE on the various aging computers I saved from the tip.
If you can pass the validation test, then how the page displays is entirely up to the browser. After it passes the test, check it in netscape 4/6, Opera 6, and IE 6, and you should be as close to perfection as it's going to get in all your visitors views.