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I wonder why some tags placed under questions look slightly like 3d-buttons, but others look like 2d with a thicker, darker border? I only notice a difference here on Meta SO.

What's the difference?

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up vote 9 down vote accepted

Thick grey border - Required tag

Each question must include at least one of these tags:

Red tags - Moderator only

Only moderators can set these to a question:

Questions migrated from the other sites to Meta, along with those older than the tag requirements, may slip through without a required tag.

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Thank you! I could have seen it for myself ;) – Martin Oct 8 '09 at 8:10

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