ble", -1],
  ["fieldset", -1],
  ["output", -1],
  ["slot", -1],
];
const tabIndexValue = [-1, 0, 1];
for (const entry of defaultList) {
  const element = document.querySelector(entry[0]);
  test(() => {
    assert_equals(element.tabIndex, entry[1]);
  }, entry[0] + ".tabIndex should return " + entry[1] + " by default");
  for (const setValue of tabIndexValue ) {
    test(() => {
      element.setAttribute("tabindex", setValue);
      assert_equals(element.tabIndex, setValue);
    }, entry[0] + ".tabIndex s