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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [Protocol](./puppeteer.protocol.md) &gt; [DOM](./puppeteer.protocol.dom.md) &gt; [Node](./puppeteer.protocol.dom.node.md) &gt; [systemId](./puppeteer.protocol.dom.node.systemid.md)

## Protocol.DOM.Node.systemId property

`DocumentType`<!-- -->'s systemId.

<b>Signature:</b>

```typescript
systemId?: string;
```