---
id: fast-element.controller.definition
title: Controller.definition property
hide_title: true
---
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[@microsoft/fast-element](./fast-element.md) &gt; [Controller](./fast-element.controller.md) &gt; [definition](./fast-element.controller.definition.md)

## Controller.definition property

The element definition that instructs this controller in how to handle rendering and other platform integrations.

<b>Signature:</b>

```typescript
readonly definition: FASTElementDefinition;
```