What means a blank between two Tags in CSS ? How to setup a margin top of a TABLE?

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When I inspect a CSS I found entries of the kind

TABLE TD { .... }

Mind the blank betwen the two tags! What does that mean?
Do all following instructions apply to the list of tags before?

I thought such a list will be concatenated by commas.

Furthermore I would like to setup a margin before (=to the top/north) of a TABLE.
Can I simply write

margintop: 20px;

Or how do I specify it otherwise?


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