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# kCTSuperscriptAttributeName

Controls vertical text positioning.

```
let kCTSuperscriptAttributeName: CFString
```

## Discussion

Value must be a <doc://com.apple.documentation/documentation/CoreFoundation/CFNumber> object. Default is integer value `0`. If supported by the specified font, a value of `1` enables superscripting and a value of `-1` enables subscripting.

---

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