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# standardDimension

The system standard layout dimension for reserved layout size.

```
static let standardDimension: CGFloat
```

## Discussion

Setting the [`reservedLayoutSize`](/documentation/UIKit/UIListContentConfiguration-swift.struct/ImageProperties-swift.struct/reservedLayoutSize) width or height to this constant results in using the system standard value for a symbol image for that dimension, even when the image is not a symbol image.

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