This article describes the aria-activedescendant property.
The aria-activedescendant property is used for composite widgets when more than one children are present. It makes do with the overhead of having all or more than one children focusable. As the name specifies, it helps in managing the current active child of the composite widget.
Possible effects on user agents and assistive technology
The user agent, which is any software that retrieves, renders and facilitates end user interaction with Web content uses the aria-activedescendant property to indorm the assistive technology about the active child which has focus. This active child using the aria-activedescendant property must always be visible on screen and must be a descendant of the container in the Document Object Model.
ARIA attributes used
Related ARIA techniques
TBD: Add support information for common UA and AT product combinations