Whether the element delegates the focus to its children.
If the element delegates its focus, when it becomes 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's determined automatically using a set of rules.
The chosen element will be the first child or recursive child that
For more information, refer to Focus system in UI Toolkit.
Additional resources: VisualElement.contentContainer, IFocusRing