mirror of
https://github.com/reactjs/react.dev.git
synced 2026-02-24 12:43:05 +00:00
565aac5abe
When I first read these docs, it was not immediately clear to me that I could use `React.addons.CSSTransitionGroup` to animate a single item coming into view, or an item replacing an item already there. This was partly due to the example which rendered a list of items. This PR adds a blurb about being able to use `React.addons.CSSTransitionGroup` with one or zero items, provides a code example, and adds a note blockquote that a `key` attribute must always be provided on each child of `React.addons.CSSTransitionGroup`. The latter point was not immediately obvious from the original `TodoList` code example, since it renders a list which would normally require `key` attributes anyway. Test Plan: - Refreshed `http://localhost:4000/react/docs/animation.html`, saw that the docs additions rendered correctly. - Example code not tested (it was extracted from working code).