**WindowExtensionAbility** inherits from **ExtensionAbility**. The content in a **WindowExtensionAbility** object can be displayed as an ability component in other application windows.
> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
>
> The APIs provided by this module are system APIs.
>
> The APIs of this module can be used only in the stage model.
| want | [Want](js-apis-application-Want.md) | Yes| Information related to this Window Extension ability, including the ability name and bundle name. |
| want | [Want](js-apis-application-Want.md) | Yes| Information related to this Window Extension ability, including the ability name and bundle name. |