---
id: fast-element.attributedefinition.mode
title: AttributeDefinition.mode property
hide_title: true
---
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[@microsoft/fast-element](./fast-element.md) &gt; [AttributeDefinition](./fast-element.attributedefinition.md) &gt; [mode](./fast-element.attributedefinition.mode.md)

## AttributeDefinition.mode property

The [AttributeMode](./fast-element.attributemode.md) that describes the behavior of this attribute.

<b>Signature:</b>

```typescript
readonly mode: AttributeMode;
```