This dark mode topic came up in the past, and I commented similarly. One (typically knowledgeable) HN reader replied to my comment with an explanation about th

This dark mode topic came up in the past, and I commented similarly. One (typically knowledgeable) HN reader replied to my comment with an explanation about this. I would have to really dig to find it though... I'm not sure, but I suspect that in general, dark mode syntax highlighted (highlit?) text is on average lower contrast than syntax highlighted light mode text. That could affect compression behaviors, perhaps.