Where do you see issues with browser support in particular? MDN claims that color-scheme is widely available and light-dark() is baseline as of this year https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/light-dark. I hope my users have browsers newer than May 2024 (is that... naive?)
Oh and I also *just* found Sara Joy :happy_pepper: (npub1jpy…yfwv) 's article at https://css-tricks.com/come-to-the-light-dark-side/#aa-what-makes-using-color-scheme-and-light-dark-better-than-using-media-queries which points out that it makes implementing a JS based switcher easier, which is nice :)