React releases updates 19.2 and 19.3 with new rendering features

The React team has released updates for the React 19 series, including version 19.2 and 19.3.

React 19.2 introduces the Activity component, which allows developers to break applications into prioritized activities. It features two modes: 'visible' for normal processing and 'hidden' to unmount effects and defer updates, enabling background pre-rendering of content to improve navigation speed. Other features in this release include useEffectEvent, cacheSignal, and performance tracks.

React 19.3 stabilizes several previously experimental features. Key additions include View Transitions for smooth, native-like animations during updates, and Fragment Refs for managing groups of elements without a single wrapper. The update also introduces the browser() function to prevent server-side rendering for specific components, adds Trusted Types support for enhanced DOM security, and enables Context in Server Components.