Never understood why StrangeAttractor marked the issue resolved and took the answer of rsi?
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Please refer to the source:
habrahabr.ru/info/help/karma/\r
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vote for Abramovic or comment in a negative way — karma ≥5;
to raise / lower the karma of another user's karma >5;
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Since the amount of karma equal to 5, the user has the ability to change the karma of other users a message: "you have 5 votes for the karma, topics, questions and 10 for answers and comments" for users with the size of the karma 5 I believe nothing more than a bug with a minimal level of importance.
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Why not write when karma 5:
You have 5 votes for topics, questions and 10 for answers and comments
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And even when karma 6:
You have 6 votes for the karma, topics, questions and 12 for answers and comments
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After all, the question is not about why there is no possibility to change the karma, and that is why there is no possibility to change the karma when it says that karma can be!