---
title: "duplicate(using:for:completionHandler:)"
framework: webkit
role: symbol
role_heading: Instance Method
path: "webkit/wkwebextensiontab/duplicate(using:for:completionhandler:)"
---

# duplicate(using:for:completionHandler:)

Called to duplicate the tab.

## Declaration

```swift
optional func duplicate(using configuration: WKWebExtension.TabConfiguration, for context: WKWebExtensionContext, completionHandler: @escaping ((any WKWebExtensionTab)?, (any Error)?) -> Void)
```

```swift
optional func duplicate(using configuration: WKWebExtension.TabConfiguration, for context: WKWebExtensionContext) async throws -> (any WKWebExtensionTab)?
```

## Parameters

- `configuration`: The tab configuration influencing the duplicated tab’s properties.
- `context`: The context in which the web extension is running.
- `completionHandler`: A block that must be called upon completion. It takes two arguments: the duplicated tab (or \c nil if no tab was created) and an error, which should be provided if any errors occurred.

## Discussion

Discussion This is equivalent to the user selecting to duplicate the tab through a menu item, with the specified configuration. No action is performed if not implemented.