HTML5 & CSS media attributes media queries question

I was wondering what does the operators and, only, not and the comma , do an开发者_JAVA百科d mean when used with the media queries?

Are there any other operators that can be used with the media queries?

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Please read the Media Queries Specification, it's only 1 page long. In summary though:

• and means both things must match
• , means one of the things must match
• not means the query is true when it doesn't match
• only is mentioned in the spec but I can't find a definition. I suspect it does nothing.