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assistant tools](/docs/extending/embedding/assistant-harness/)UI kit[The Jx UI kit](/docs/extending/ui-kit/)Reference[Protocol routes](/docs/extending/reference/studio-routes/)[Implementation status](/docs/extending/reference/implementation-status/)[Spec changelog](/docs/extending/reference/spec-changelog/)[Standards alignment](/docs/extending/reference/standards/)Contributing[Working in the monorepo](/docs/extending/contributing/monorepo/)[Contributing to these docs](/docs/extending/contributing/docs/)[AI assistant evals](/docs/extending/contributing/ai-evals/) # Color schemes A Jx design can ship light and dark variants of its tokens, follow the visitor's OS preference by default, and still let the visitor force either scheme with a switcher. The whole mechanism builds on [named media breakpoints](/docs/framework/concepts/styling#named-media-breakpoints), with no separate theme system. ## Declaring scheme support Add a **scheme query** to `$media` in `project.json`, an entry whose value is exactly a `prefers-color-scheme` query: ```json shiki ``` Then override any design token (or any style property) per scheme with an `@--dark` block. Convention: author the light values as the base and the dark values as overrides. ```json shiki ``` `@--dark` blocks work in component and element styles too, exactly like responsive breakpoints: ```json shiki ``` ## What declaring a scheme query does Declaring a scheme query opts the site into the forced-scheme contract: - Every `@--dark` block is emitted twice: once inside `@media (prefers-color-scheme: dark)` (applies in **auto** mode), and once under `:root[data-color-scheme="dark"]` (applies when the scheme is **forced**). Both copies are specificity-neutral, so your cascade is unchanged. - A [`@keyframes`](/docs/framework/concepts/styling) block inside a scheme block is the one exception: it is emitted once, under the media-guarded copy. The forced copy works by re-pointing a selector, an animation name has none, and a second copy of one name would replace the first for every visitor. - `color-scheme: light dark` is declared on `:root`, with forced-mode overrides, so native form controls and scrollbars follow along. Set `colorScheme` in the project `style` yourself and your value replaces that declaration, on `:root` as well: `light-dark()` resolves against the element carrying `color-scheme`, so a value on `body` would leave every token on `:root` reading the browser default. A block keyed `&[...]` at the top of the project `style` is a state of the root element, so `&[data-theme="light"]` becomes `:root[data-theme="light"]` in the built page and on the Studio canvas alike. - A tiny inline script is injected at the top of `` that restores the visitor's persisted choice before first paint, so a forced scheme never flashes. ## The visitor override contract Two constants make up the contract: | Constant | Where | Meaning | | ------------------- | --------------------- | ------------------------------------------------------- | | `data-color-scheme` | attribute on `` | `"light"` or `"dark"` forces that scheme; absent = auto | | `jx-color-scheme` | `localStorage` key | persisted forced scheme; absent = auto | A switcher only needs to keep the two in sync. Cycling auto → light → dark: ```js shiki ``` The pre-paint script (injected automatically) reads the storage key on the next load, so the choice sticks across pages and visits. Note Only *pure* scheme queries participate: `(prefers-color-scheme: dark)` with nothing else attached. A compound query like `(prefers-color-scheme: dark) and (min-width: 768px)` compiles as a plain media query and does not respond to the forced attribute. Tip Studio shows Auto/Light/Dark segments among the context bar's **Context** controls whenever the project declares a scheme query, and the design token editor can author the `@--dark` values for you. ✕ Start here[Overview](/docs/start/)Get started[Install Jx Studio](/docs/start/install/)[Your first project](/docs/start/first-project/)[A tour of Jx Studio](/docs/start/studio-tour/)Tutorials[Tutorial: interactive component](/docs/start/first-component/)[Tutorial: blog with collections](/docs/start/first-collection/)[Video tutorials](/docs/start/videos/)Coming from another tool[Coming from WordPress](/docs/start/coming-from-wordpress/)[Coming from Webflow or Framer](/docs/start/coming-from-webflow/)[Coming from Wix or Squarespace](/docs/start/coming-from-wix/)[Coming from Lovable or Builder.io](/docs/start/coming-from-ai-builders/)Studio[Overview](/docs/studio/)[The desktop app](/docs/studio/desktop/)The workspace[Overview](/docs/studio/interface/)[Welcome 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agents[Overview](/docs/framework/agents/)[Authoring rules for agents](/docs/framework/agents/authoring-rules/)[Machine-readable docs](/docs/framework/agents/machine-readable/)Reference[Overview](/docs/framework/reference/)[Formula catalog](/docs/framework/reference/formulas/)[Operator reference](/docs/framework/reference/operators/)Extending[Overview](/docs/extending/)Extensions[Extension anatomy](/docs/extending/extensions/anatomy/)[Schema composition](/docs/extending/extensions/schema-composition/)[Custom classes](/docs/extending/extensions/classes/)[Custom formats](/docs/extending/extensions/formats/)[Capability methods](/docs/extending/extensions/capabilities/)[Project sections](/docs/extending/extensions/project-sections/)[Server mounts](/docs/extending/extensions/server/)[Connectors](/docs/extending/extensions/connectors/)[Search indexes](/docs/extending/extensions/search/)[Security and secrets](/docs/extending/extensions/security/)[Tutorial: a TOML 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