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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [Protocol](./puppeteer.protocol.md) &gt; [HeadlessExperimental](./puppeteer.protocol.headlessexperimental.md)

## Protocol.HeadlessExperimental namespace

This domain provides experimental commands only supported in headless mode.

<b>Signature:</b>

```typescript
export namespace HeadlessExperimental 
```

## Enumerations

|  Enumeration | Description |
|  --- | --- |
|  [ScreenshotParamsFormat](./puppeteer.protocol.headlessexperimental.screenshotparamsformat.md) |  |

## Interfaces

|  Interface | Description |
|  --- | --- |
|  [BeginFrameRequest](./puppeteer.protocol.headlessexperimental.beginframerequest.md) |  |
|  [BeginFrameResponse](./puppeteer.protocol.headlessexperimental.beginframeresponse.md) |  |
|  [NeedsBeginFramesChangedEvent](./puppeteer.protocol.headlessexperimental.needsbeginframeschangedevent.md) | Issued when the target starts or stops needing BeginFrames. Deprecated. Issue beginFrame unconditionally instead and use result from beginFrame to detect whether the frames were suppressed. |
|  [ScreenshotParams](./puppeteer.protocol.headlessexperimental.screenshotparams.md) | Encoding options for a screenshot. |