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How does Meta Stack Overflow work?

Some of tag in stackoverflow tag list are with different color. such as below :

tag color

I want to know why some of this tag are in other color background.

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marked as duplicate by animuson, Bart, Mat, jonsca, Toon Krijthe Jun 17 '12 at 9:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

#These are moderator only tags. See… – Somnath Muluk Jun 17 '12 at 8:58
up vote 3 down vote accepted

These are moderator only tags.

See How does Meta Stack Exchange work?

And also this can be responses of moderation or feature request or discussion.

See this also Does MSO provide which bugs are being solved?

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