[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [HeadlessExperimental](./puppeteer.protocol.headlessexperimental.md) > [NeedsBeginFramesChangedEvent](./puppeteer.protocol.headlessexperimental.needsbeginframeschangedevent.md) > [needsBeginFrames](./puppeteer.protocol.headlessexperimental.needsbeginframeschangedevent.needsbeginframes.md) ## Protocol.HeadlessExperimental.NeedsBeginFramesChangedEvent.needsBeginFrames property True if BeginFrames are needed, false otherwise. Signature: ```typescript needsBeginFrames: boolean; ```