---
title: WebPlugInContainerKey
framework: WebKit
role: symbol
role_heading: Global Variable
platforms: [macOS 10.3+]
path: webkit/webplugincontainerkey
---

# WebPlugInContainerKey

An object that conforms to the WebPlugInContainer informal protocol. This object is used for callbacks from the plug-in to the enclosing application. If WebPlugInContainerKey is nil, no callbacks will occur.

## Declaration

```swift
let WebPlugInContainerKey: String
```

## See Also

### WebKit Constants (Legacy)

- [WebActionButtonKey](webkit/webactionbuttonkey.md)
- [WebActionElementKey](webkit/webactionelementkey.md)
- [WebActionModifierFlagsKey](webkit/webactionmodifierflagskey.md)
- [WebActionNavigationTypeKey](webkit/webactionnavigationtypekey.md)
- [WebActionOriginalURLKey](webkit/webactionoriginalurlkey.md)
- [WebArchivePboardType](webkit/webarchivepboardtype.md)
- [WebElementDOMNodeKey](webkit/webelementdomnodekey.md)
- [WebElementFrameKey](webkit/webelementframekey.md)
- [WebElementImageAltStringKey](webkit/webelementimagealtstringkey.md)
- [WebElementImageKey](webkit/webelementimagekey.md)
- [WebElementImageRectKey](webkit/webelementimagerectkey.md)
- [WebElementImageURLKey](webkit/webelementimageurlkey.md)
- [WebElementIsSelectedKey](webkit/webelementisselectedkey.md)
- [WebElementLinkLabelKey](webkit/webelementlinklabelkey.md)
- [WebElementLinkTargetFrameKey](webkit/webelementlinktargetframekey.md)