Who's received a black bar?
I'm not sure when Hacker News started adorning a black bar on top of the website after a significant person passed, but I compiled a list of people who've received it starting from 2016.
Sir Clive Sinclair
How I got this list
This list was compiled using a simple Python script that recursively requested HN's Algolia search API for posts containing "has died". For each relevant hit, I pulled in snapshots from the Wayback Machine to see if the HTML document contained the black bar element at the end of the day the post was created. It's possible there are names missing.
August 20, 2023: added Kris Nóva
August 6, 2023: added Kevin Mitnick