# Sandbox.UI.Transitions

Handles the storage, progression and application of CSS transitions for a single [Sandbox.UI.Panel](/api/Sandbox.UI.Panel).

- Kind: class
- Namespace: `Sandbox.UI`
- Assembly: `Sandbox.Engine`
- Modifiers: sealed

## Fields

- [`Entries`](/api/Sandbox.UI.Transitions/Entries): Active CSS transitions.

## Properties

- [`HasAny`](/api/Sandbox.UI.Transitions/HasAny): Whether there are any active CSS transitions.