Sometimes when I'm browsing at night, and have the OS/browser set to dark mode, it's really annoying when one website suddenly defaults to light mode instead of respecting my settings. The only thing more annoying is to have to do this repeatedly for multiple websites. In fact, when I'm working/browsing at night (without the lights) I enable an extension which will forcibly render all pages in dark mode, using some pre-specified heuristics to convert colors.