The focus box defines the *focused* part of the node. This is relevant in nodes which may have a selectable
subset, such as a dropdown box, which may be more important at present moment (selected). Scrolling actions
like scrollIntoView will use the focus box to make sure the selected area is presented to the user.
The focus box defines the *focused* part of the node. This is relevant in nodes which may have a selectable subset, such as a dropdown box, which may be more important at present moment (selected). Scrolling actions like scrollIntoView will use the focus box to make sure the selected area is presented to the user.