---
title: penUpperSide
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsevent/buttonmask-swift.struct/penupperside
---

# penUpperSide

A mask that matches the button on the upper side of the device.

## Declaration

```swift
static var penUpperSide: NSEvent.ButtonMask { get }
```

## See Also

### Getting the Tablet Button Masks

- [penTip](appkit/nsevent/buttonmask-swift.struct/pentip.md)
- [penLowerSide](appkit/nsevent/buttonmask-swift.struct/penlowerside.md)