static get _compatibleRoles() {
    return [
      'combobox',
      'gridcell',
      'input',
      'listbox',
      'radiogroup',
      'select',
      'spinbutton',
      'textarea',
      'textbox',
      'tree',
    ];
  }
In order to prevent accessibility violations, the aria-required attribute will
be combined with compatible aria roles: https://www.w3.org/TR/wai-aria/#aria-required