Whether the element should delegate the focus to its children.
If the element delegates its focus, when it would become focused, one of its child or recursive child
elements is selected to receive focus in its place.
The element that receives the focus cannot be chosen manually.
Instead, it is determined automatically using a set of internal rules.
The chosen element will be the first child or recursive child that
Additional resources: Focusable.canGrabFocus, VisualElement.contentContainer, IFocusRing