The new GitHub dark mode is a very welcome addition. I thank you, and so do all my eyes.
A significant issue I’ve noticed is that the GitHub web application seems to currently ignore the web browser’s prefers-color-scheme setting.
I see your CSS has an
@media ruleset checking for
prefers-color-scheme:dark, but that ruleset seems to have no impact in creating a dark mode. I haven’t had time to debug all your code to determine why!
As a first step in determining the cause of the issue, I wrote a little to code to verify that, in fact, my test browser appropriately sets
prefers-color-scheme:dark. It does.