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Oct 9, 2021
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Update built-in-components.md #1272

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10 changes: 10 additions & 0 deletions src/api/built-in-components.md
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Expand Up @@ -62,6 +62,16 @@ import { KeepAlive, Teleport, Transition, TransitionGroup } from 'vue'

Registration is not required if you pass the component itself to `is` rather than its name.

- **key:**

When using <component :is="vnode"> and passing vnode of the same type, you need to provide keys:

```html
<component :is="current" :key="selected" />
```

Otherwise, you are passing two compiled vnodes of the same type to the renderer. Because they are compiled as completely static, they will not be updated at all.

- **See also:** [Dynamic Components](../guide/component-dynamic-async.html)

## transition
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