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Mostly things that is for text-to-speech and things like that. Also several pseudo-classes and pseudo-elements are not supported like hover. However, most readers do not support pseudo-elements anyway. In general you can say that the more complex the CSS will be, the less chance there is it will be supported at this time.
In paragraph 3.3 of the link I sent you can see what the default values are. There you can also see for example that the default value for the auto margin is 0.
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