---
id: fast-foundation.designsystem
title: DesignSystem variable
hide_title: true
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[@microsoft/fast-foundation](./fast-foundation.md) &gt; [DesignSystem](./fast-foundation.designsystem.md)

## DesignSystem variable

An API gateway to design system features.

<b>Signature:</b>

```typescript
DesignSystem: Readonly<{
    tagFor(type: Constructable): string;
    responsibleFor(element: HTMLElement): DesignSystem;
    getOrCreate(node?: Node | undefined): DesignSystem;
}>
```