Describes the role of an accessibility node.
| None | The accessibility node has no roles. |
| Button | The accessibility node behaves like a button. |
| Image | The accessibility node behaves like an image. |
| StaticText | The accessibility node behaves like static text that can't change. |
| SearchField | The accessibility node behaves like a search field. |
| KeyboardKey | The accessibility node behaves like a keyboard key. |
| Header | The accessibility node behaves like a header that divides content into sections (for example, the title of a navigation bar). |
| TabBar | The accessibility node behaves like an ordered list of tabs. |