ows assistive technologies to gather information about the component and its state.

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### What to do

* Verify that the `aria-activedescendant` attribute value is the `id` of the currently active child element;
* **And**, verify that the child element is not hidden;
* **And**, verify that the child element is either a descendant of this element, or is owned by this element (indicated by using the aria-owns attribute on this elem