I often see someone post a comment saying "Possible duplicate of [another question]" and then a dialog shows right under the title of my question asking me if the supplied question has answered mine. How does such a comment work and how do I post one?

  • If you flag or VTC it as a duplicate, such comments automatically appear, and to the OP, the dialog always is always shown. – M.A.R. Apr 29 '17 at 5:09
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    Like this? – Journeyman Geek Apr 29 '17 at 5:19

How does such a comment work and how do I post one?

Such comments are automatically applied if the question was close flagged / voted for the duplicate reason. There are generally two ways to place them at a question:

  1. If a user is below 3,000 reputation, they can flag it and choose duplicate from the pop-up dialogue.

  2. If a user has close voting privileges (3,000+ rep), they can click the close link and choose duplicate from the pop-up dialogue.

A manually constructed comment would not have the same effect, but the proposed link will appear in the Linked section beneath the question.

If the asker accepts the dialogue you've mentioned, the question will be immediately closed by Community ♦︎.

Otherwise it takes 5 users with the close voting privilege, a gold badge holder for one of the question's tags, or a moderator to mark the question as duplicate.

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    Note that if a comment (even a manually written one) containing a link to the proposed dupe already exists, the "possible duplicate" one won't be generated when somebody flags/vtc's. The existing one will just be upvoted. – Jason C Apr 29 '17 at 23:01

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