Thanks for posting this. It sometimes feels like every web developer on the planet is all-in on dark themes, so it's great to see someone doing this kind of analysis. For the record, I've yet to see a dark theme that I can view for more than about 60 seconds before my vision becomes blurry (see boot13.com/firefox/dark-mode-rant/). I encourage developers to provide light theme options, but I also use tools like Tranquility when that's not available.