Animate Radix Primitives with CSS keyframes or the JavaScript animation library of your choice.

Animation of Radix Primitives can generally be summed in terms of the entering and exiting phases of a stateful component. In either case, adding animation to a Primitives component should feel similar to any other component, but there are some caveats noted here in regards to exiting animations with JS animation libraries.

The simplest way to animate Primitives is with CSS. You can use either transition or animation and it should work with entering or exiting animations as expected.

When many stateful Primitives are hidden from view, they are actually removed from the React Tree, and their elements removed from the DOM. Many JavaScript animation libraries need control of the unmounting phase, so we provide the forceMount prop on many components to allow consumers to delegate the mounting and unmounting of children based on the animation state determined by those libraries.

For example, if you want to use React Spring to animate a Dialog, you would do so by conditionally rendering its Overlay and Content parts based on the animation state from a hook like useTransition: