---
title: "addBuffer(_:name:to:)"
framework: WebKit
role: symbol
role_heading: Instance Method
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, visionOS 27.0+]
path: "webkit/wkusercontentcontroller/addbuffer(_:name:to:)"
---

# addBuffer(_:name:to:)

Adds a data buffer that will be available to JavaScript through the window.webkit.buffers object.

## Declaration

```swift
@MainActor @preconcurrency func addBuffer(_ buffer: RawSpan, name: String, to contentWorld: WKContentWorld)
```

## Parameters

- `buffer`: The buffer to add.
- `name`: The name of the buffer to be referenced from JavaScript. e.g. with a name parameter of "mybuffer", JavaScript can reference the buffer via window.webkit.buffers.mybuffer.
- `contentWorld`: The WKContentWorld to add the buffer to. The buffer will only be visible to JavaScript executing in that content world.