What's up with that?
Example: https://imgur.com/KOy428e
Mourning band, I assume for Dan Kaminsky.
It would be similarly helpful to have information displayed when hovering on the black bar at the top of the HN page.
While most of us know that it signifies that somebody important in the tech world has died, we don't have any specific information who has died.
I sometimes find some tech person who has died in the news, only to find that the black bar was intended for remembrance of somebody else.