in src/helpers/tabbable.js [67:77]
export default function findTabbableDescendants(element) {
const descendants = [].slice
.call(element.querySelectorAll("*"), 0)
.reduce(
(finished, el) => finished.concat(
!el.shadowRoot ? [el] : findTabbableDescendants(el.shadowRoot)
),
[]
);
return descendants.filter(tabbable);
}