IE 3+ and Netscape 4+ support various levels of CSS1.
IE4+ and Netscape 6+ support various levels of CSS2.
There is no way to check for CSS support in Javascript other than checking each property on the object in question. You can check for DOM support and/or layer support and assume that if these exist then there is some level of CSS support there, but you can't check which attributes each browser supports and doesn't support. For a good browser detection script check out the tutorials located in the Scriptorium at ww.bratta.com/.
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