 descriptions of keyboard commands mention focus, they are referring to the visual focus indicator.
          For more information about this focus management technique, see
          <a href="../../../practices/keyboard-interface/keyboard-interface-practice.html#kbd_focus_activedescendant">Managing Focus in Composites Using aria-activedescendant</a>.
        </p>
        <table aria-labelledby="kbd_label_listbox kbd_label" class="def">
          <thead>
            <tr>
              <th>Key</th>
         