The black bar appears in honor &#x2F; remembrance &#x2F; expression of sorrow &#x2F; etc. of someone who has recently passed away. In this case, I presume: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10557793" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10557793</a>