Before you go tinkering with Canary just be advised: Canary is Google’s “bleeding edge” Chrome OS path, which receives daily updates of features before they’ve been widely tested. It can only be accessed from Chromebooks switched into a special developer mode (not to be confused with the Chrome OS Developer channel). Google warns that Canary can be “unstable.”
But at the moment, to activate dark mode on your Chromebook, you need to have the Canary channel installed. Once you’ve done that, Android Central says you just open Chrome and type in chrome://flags/#enable-force-dark and chrome://flags/#enable-webui-dark-mode into the URL bar. I should note I tried this on my older Chromebook and wasn’t able to get it to work. But here’s the view Android Police captured:
Android Central says the dark mode has some bugs, but notes it seems to apply across the UI, not just as darker backgrounds.
Google has rolled out dark mode versions for its Gmail, Google Calendar, Google Fit, and its mobile app over the last several months. Both iOS and Android both began supporting dark mode at the system level last year.
We reached out to Google to see if there are plans to roll out dark mode in Chrome OS to all users, and will update if we hear back.