I just finished a layout using CSS and I'm aware that browsers 4.0 and earlier (or is it 3.0 and earlier?) won't be able to display it right. However, I also know that the browsers that do support CSS don't all display it the exact same way. I tested my layout using Internet Explorer 6 and Mozilla 1.6. I had to make a few changes to get Mozilla to display it close to what I intended. My question: which other browsers and versions should I test it on?