# Dimensions

The Dimensions object is a JSON-formatted object containing context information about dimensions of the iFrame on which the canvas app appears.

| Field          | Description                                                                                                                                                                                                                                                                                                                                                                            |
| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `clientHeight` | The values of `clientHeight` are sent to the canvas app within SignedRequest and can be used to set the height of the outermost `div` element. This field is useful for setting the height of an app that’s accessed from a mobile device. The field can be referenced as `sr.context.environment.dimensions.clientHeight`, where `sr` is the parsed signed request JavaScript object. |
| `clientWidth`  | The values of `clientWidth` are sent to the canvas app within SignedRequest and can be used to set the width of the outermost `div` element. This field is useful for setting the width of an app that’s accessed from a mobile device. The field can be referenced as `sr.context.environment.dimensions.clientWidth`, where `sr` is the parsed signed request JavaScript object.     |
| `height`       | The height of the iFrame in pixels.                                                                                                                                                                                                                                                                                                                                                    |
| `width`        | The width of the iFrame in pixels.                                                                                                                                                                                                                                                                                                                                                     |
| `maxHeight`    | The maximum height of the iFrame in pixels. Defaults to 2,000; “infinite” is also a valid value.                                                                                                                                                                                                                                                                                       |
| `maxWidth`     | The maximum width of the iFrame in pixels. Defaults to 1,000; “infinite” is also a valid value.                                                                                                                                                                                                                                                                                        |

The following code snippet shows an example of the Dimensions object.

```nolang
"dimensions": 
{ 

    "clientHeight": "50px", 
    "clientWidth": "70px", 
    "height": "900px", 
    "width": "800px", 
    "maxHeight": "2000px", 
    "maxWidth": "1000px" 
}, 

```

**See Also**

- [Environment](/docs/platform/canvas-framework/guide/environment-object.md)
- [User Interface Considerations](/docs/platform/canvas-framework/guide/canvas-app-ui-considerations.md)