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Re: Browser Compatibility
Good tools like TopStyle or HomeSite have views that show you what tags are valid in different browsers. If you have access to those tools you can use those featurse which I have found very helpful.
Some sites that are, more or less, decent:
http://www.siteexperts.com/ (IE-biased) http://developer.netscape.com/ (NS-biased)
If you want a good comparison between style sheet issues, check out: http://www.richinstyle.com/
Also check out http://www.blooberry.com/indexdot/html/
That last one will give you a lot of information but it is not always presented in the greatest fashion.
Of course, you can always check the standards-setting body for the markup: http://www.w3.org/ but you do have to keep in mind that they will not really cover differences, per se, because they are advocating one standard. Having said that you can still get useful information.
You can also do what I do which is try to develop pages that check various and sundry elements and then try them in each browser. Usually I base this off of the DOM (from the W3C) and see how each browser handles it.
Also check out http://www.webreference.com/ which routinely posts articles on just this sort of thing. ZDNet does likewise although not as often as WebReference.