I 'm getting problem with designing by CSS on IE6,IE7,FireFox. A lot property on FireFox don't support on IE6. Please tell me about diffirence between IE6,IE7 and FireFox. If any, tell me a litte example about diffirence between them. Thanks so much

For one thing, they all use a different default style sheet. One suggestion to fix this is explained here.
Also, here is a list of styles and browsers that support them.

IE6 is not very standards compilent. IE7 is better, but still isn't as compliant as Firefox. Also, you should note that you need to design sites that are also compatible with Safari. This won't be an issue as Safari is now on the PC side, and as far as I can tell (I use both Windows and Mac OS X), it's not much different.

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