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# setReaderModeActive(_:for:completionHandler:)

Called to set the reader mode for the tab.

```
optional func setReaderModeActive(_ active: Bool, for context: WKWebExtensionContext, completionHandler: @escaping ((any Error)?) -> Void)
```

## Parameters

`active`

A boolean value indicating whether to activate reader mode.

`context`

The context in which the web extension is running.

`completionHandler`

A block that must be called upon completion. It takes a single error argument, which should be provided if any errors occurred.

## Discussion

No action is performed if not implemented.

## See Also

[`isReaderModeAvailable(for:)`](/documentation/WebKit/WKWebExtensionTab/isReaderModeAvailable(for:))

Called to check if reader mode is available for the tab.

[`isReaderModeActive(for:)`](/documentation/WebKit/WKWebExtensionTab/isReaderModeActive(for:))

Called to check if the tab is currently showing reader mode.


---

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