= getComputedStyle(document.documentElement);
  assert_equals(style.zIndex, '2');
}, 'sibling-index() on root');

test(() => {
  let style = getComputedStyle(document.documentElement);
  assert_equals(style.widows, '2');
}, 'sibling-count() on root');
  </script>
</body>
</html>
