[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [DOM](./puppeteer.protocol.dom.md) > [ChildNodeCountUpdatedEvent](./puppeteer.protocol.dom.childnodecountupdatedevent.md) ## Protocol.DOM.ChildNodeCountUpdatedEvent interface Fired when `Container`'s child node count has changed. Signature: ```typescript export interface ChildNodeCountUpdatedEvent ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [childNodeCount](./puppeteer.protocol.dom.childnodecountupdatedevent.childnodecount.md) | [integer](./puppeteer.protocol.integer.md) | New node count. | | [nodeId](./puppeteer.protocol.dom.childnodecountupdatedevent.nodeid.md) | [NodeId](./puppeteer.protocol.dom.nodeid.md) | Id of the node that has changed. |