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# prefersHeadAnchorAlternativeDidChangeNotification

A notification that posts when the system setting for head-anchored content changes.

```
static var prefersHeadAnchorAlternativeDidChangeNotification: Notification.Name { get }
```

## Discussion

The system sends this notification when the setting for head-anchored content changes.
When you receive this notification, call [`prefersHeadAnchorAlternative`](/documentation/Accessibility/AccessibilitySettings/prefersHeadAnchorAlternative) to get
the new setting.

On Apple Vision Pro, apps can create a heads-up display effect by setting up content
to follow the person’s head position. This effect allows the content to remain in
the same position, no matter where the person looks. However, some assistive technologies
are incompatible with this type of content. For example, a technology might use the
person’s head movements to control the current selection, or they might magnify content
to make it easier to read. Anchoring content to the head position prevents these
technologies from interacting with that content.

---

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