I love HN, but I also love dark mode. I wanted dark mode HN on my iPhone without any extension/third party app/proxy fuss, so I made this bookmarklet. One tap on news.ycombinator.com and dark mode sticks across page navigations. I'm sure this has been done before, but I couldn't find a solution that satisfied me. Thought I'd share in case anyone is in the same boat.

How it works: bookmarklets normally die on the first navigation. This one replaces the page with a same-origin iframe pointing at HN, then re-injects CSS on every iframe load. Since the iframe is same-origin, everything (cookies etc) should work normally. I've tested this in Chromium/Linux and Safari/iOS.