If I have this right, the ePub standard officially supports all css properties (and a couple more), however not all devices do so.
For example iBooks on iPad appears to ignore top and bottom margins (though I've not tried to track that down yet).
Are there any resources which note these discrepencies?
If not, and I made a web site database thingy that let people register css / device / epub oddities, would there be any interest in the community filling it in?
(by the way, if the answer is yes, I'd be happy to receive suggestions as to what could be included...)