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text-transform, as DaleDe points out, is not included in the ePub spec, so you should not expect it to work, and in particular you should not depend on it.
visibility is another such property that would be useful in some cases.
font-variant:smallcaps, however should be supported, but it mostly isn't, so you should not rely on it either (but you can blame the readers, and Adobe in particular, for that). Same with pseudo-elements (:first-letter, :first-line).
auto margins will often not work as expected, because the spec allows them to be ignored, and they often are.
Complex selectors (h2 + p, div.poetry div.stanza p, etc) in my experience work fine, but they may fail in some reader. Just don't try to be too smart.
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