[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Accessibility](./puppeteer.protocol.accessibility.md) > [GetPartialAXTreeRequest](./puppeteer.protocol.accessibility.getpartialaxtreerequest.md) > [backendNodeId](./puppeteer.protocol.accessibility.getpartialaxtreerequest.backendnodeid.md) ## Protocol.Accessibility.GetPartialAXTreeRequest.backendNodeId property Identifier of the backend node to get the partial accessibility tree for. Signature: ```typescript backendNodeId?: DOM.BackendNodeId; ```