Used in Roles
No role required.
This property applies to live regions in the user interface. If authors know that multiple parts of the same live region need to be loaded, they can set **aria-busy** to **true** when the first part is loaded, and then set it to **false** when the last part is loaded. **Note** For cross-browser compatibility, always use the WAI-ARIA attribute syntax to access and modify ARIA properties, for example `object.setAttribute("aria-valuenow", newValue)`.