dark-mode-implementationlisted
Install: claude install-skill jacob-balslev/skill-graph
# Dark Mode Implementation
## Coverage
A dark mode implementation handles five concerns: detecting the user's preference (system, explicit choice, persisted choice), applying the right theme before first paint, propagating theme changes at runtime, swapping color-sensitive assets, and updating browser-chrome hints. Each has well-defined web platform primitives.
Detection uses the prefers-color-scheme media query (window.matchMedia('(prefers-color-scheme: dark)')), which reflects the operating system or browser-level preference. Most products offer three user choices — System, Light, Dark — where System defers to the media query and the other two override it. The chosen mode is persisted (localStorage or a cookie) and read on every load. The CSS color-scheme property tells the user agent which schemes a page supports, enabling correct rendering of native form controls, scrollbars, and the default page background; declare color-scheme: light dark on :root for sites that support both.
Flash-of-incorrect-theme (sometimes called FOUC for theme) occurs when the browser paints the light default before the persisted dark preference is applied. The fix is a small, blocking inline script in <head> that reads the persisted preference and sets a class or data attribute on <html> synchronously before stylesheets resolve. Frameworks with server-side rendering must serialize the resolved theme into the HTML response, often by reading a cookie on the server.
The CSS Color Module Level 5