jsx-a11y/aria-activedescendant-has-tabindex

aria-activedescendant tells a screen reader which child of a widget is active while focus stays on the widget itself. That only works if the widget can take focus. A plain div can't, so the attribute does nothing there until you add a tabIndex of 0 or -1.

Elements that are focusable by default, such as input, select and button, don't need a tabIndex. Components aren't checked.

Configure

Off by default. To turn it on:

[lint.rules]
"jsx-a11y/aria-activedescendant-has-tabindex" = "error" # or "warn"

Examples

Reported:

const list = (
  <div role="listbox" aria-activedescendant={activeId}>
    {options}
  </div>
);

Not reported:

const list = (
  <div role="listbox" tabIndex={0} aria-activedescendant={activeId}>
    {options}
  </div>
);

const grid = <div role="grid" tabIndex={-1} aria-activedescendant={activeId} />;
const search = <input role="combobox" aria-activedescendant={activeId} />;