---
title: expansion
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsattributedstring/key/expansion
---

# expansion

The expansion factor of the text.

## Declaration

```swift
static let expansion: NSAttributedString.Key
```

## Discussion

Discussion The value of this attribute is an NSNumber object containing a floating point value indicating the log of the expansion factor to be applied to glyphs. The default value is 0, indicating no expansion.

## See Also

### Deprecated Keys

- [obliqueness](foundation/nsattributedstring/key/obliqueness.md)
- [verticalGlyphForm](foundation/nsattributedstring/key/verticalglyphform.md)
- [characterShapeAttributeName](foundation/nsattributedstring/key/charactershapeattributename.md)
- [usesScreenFontsDocumentAttribute](foundation/nsattributedstring/key/usesscreenfontsdocumentattribute.md)