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Re:Ask HN: Why was there a black border on HN few days back? by degif on Wednesday January 27, 2016 @12:54PM (#10981589)
When someone important to the community dies, a thin black bar is added to the top of HN as a mark of respect [1].

[1] https://news.ycombinator.com/item?id=5990015

Re:Ask HN: Why was there a black border on HN few days back? by unexpand on Wednesday January 27, 2016 @01:47PM (#10982037)
Thanks, wasn't aware of that.