element with aria-activedescendant can't have a tabindex -1

[gaurav5430]

According to the examples on ARIA 1.1 Select , the component having aria-activedescendant can have a tabindex = -1 . Why isn't it allowed by the eslint-rule ?

<div id="exp_wrapper">
            <button aria-haspopup="listbox" aria-labelledby="exp_elem exp_button" id="exp_button">Plutonium</button>
            <ul id="exp_elem_list" tabindex="-1" role="listbox" aria-labelledby="exp_elem" class=" hidden" aria-activedescendant="exp_elem_Pu">
              <li id="exp_elem_Np" role="option" class="">Neptunium</li>
              <li id="exp_elem_Pu" role="option" class=" focused">Plutonium</li>
              <li id="exp_elem_Am" role="option" class="">Americium</li>
              <li id="exp_elem_Cm" role="option" class="">Curium</li>
              <li id="exp_elem_Bk" role="option" class="">Berkelium</li>
              <li id="exp_elem_Cf" role="option" class="">Californium</li>
              <li id="exp_elem_Es" role="option" class="">Einsteinium</li>
              <li id="exp_elem_Fm" role="option" class="">Fermium</li>
              <li id="exp_elem_Md" role="option" class="">Mendelevium</li>
              <li id="exp_elem_No" role="option" class="">Nobelium</li>
              <li id="exp_elem_Lr" role="option" class="">Lawrencium</li>
              <li id="exp_elem_Rf" role="option">Rutherfordium</li>
              <li id="exp_elem_Db" role="option">Dubnium</li>
              <li id="exp_elem_Sg" role="option">Seaborgium</li>
              <li id="exp_elem_Bh" role="option">Bohrium</li>
              <li id="exp_elem_Hs" role="option">Hassium</li>
              <li id="exp_elem_Mt" role="option">Meitnerium</li>
              <li id="exp_elem_Ds" role="option">Darmstadtium</li>
              <li id="exp_elem_Rg" role="option" class="">Roentgenium</li>
              <li id="exp_elem_Cn" role="option" class="">Copernicium</li>
              <li id="exp_elem_Nh" role="option" class="">Nihonium</li>
              <li id="exp_elem_Fl" role="option" class="">Flerovium</li>
              <li id="exp_elem_Mc" role="option" class="">Moscovium</li>
              <li id="exp_elem_Lv" role="option" class="">Livermorium</li>
              <li id="exp_elem_Ts" role="option">Tennessine</li>
              <li id="exp_elem_Og" role="option" class="">Oganesson</li>
            </ul>
          </div>

[murilocruz]

It happens when implementing a Collapsible Dropdown Listbox, wich requires a tabindex="-1"