netbox/docs/plugins/development/user-interface.md

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# User Interface
## Light & Dark Mode
The NetBox user interface supports toggling between light and dark versions of the theme. If needed, a plugin can determine the currently active color theme by inspecting `window.localStorage['netbox-color-mode']`, which will indicate either `light` or `dark`.
Additionally, when the color scheme is toggled by the user, a custom event `netbox.colorModeChanged` indicating the new scheme is dispatched. A plugin can listen for this event if needed to react to the change:
```typescript
window.addEventListener('netbox.colorModeChanged', e => {
const customEvent = e as CustomEvent<ColorModeData>;
console.log('New color mode:', customEvent.detail.netboxColorMode);
});
```