---
title: CornerMask
framework: applenewsformat
role: symbol
role_heading: Object
path: applenewsformat/cornermask
---

# CornerMask

The object for creating rounded corners.

## Declaration

```data
object CornerMask
```

## Properties

bottomLeft: A Boolean that indicates whether the bottom-left corner is masked. bottomRight: A Boolean that indicates whether the bottom-right corner is masked. curve: The type of curve to use for rendering the mask’s corner. Valid values: circular. Creates a rounded corner. continuous. Creates a continuous corner. radius: A supported unit or number that describes the radius of the corners in points. Corner radius can’t exceed half the component width or height, whichever is smaller. topLeft: A Boolean that indicates whether the top-left corner is masked. topRight: A Boolean that indicates whether the top-right corner is masked. type: The type of mask. The value is always corners.

## Discussion

Discussion Use the CornerMask object to specify the corner radius for a component, and enable or disable the effect on a per-corner basis (topRight, topLeft, bottomRight, and bottomLeft). All corners are enabled by default. When you specify a border alongside a corner radius, the borders take into account the radius of the mask and are drawn within the unmasked area of the component. You can use this object in ComponentStyle. Example {   "components": [     {       "role": "container",       "style": "exampleComponentStyle",       "components": [         {           "role": "title",           "text": "Drought"         }       ]     }   ],   "componentStyles": {     "exampleComponentStyle": {       "backgroundColor": "#FF0000",       "mask": {         "type": "corners",         "radius": 25,         "topRight": false,         "bottomRight": false       }     }   } }

## See Also

### Component Style Basics

- [Defining a Component Style](applenews/defining-a-component-style.md)
- [ComponentStyle](applenewsformat/componentstyle.md)
- [Border](applenewsformat/border.md)
- [StrokeStyle](applenewsformat/strokestyle.md)