ex=0
  // First focusable = #aboveSlots
  host.focus();
  assert_equals(shadowRoot.activeElement, aboveSlots);
  assert_equals(document.activeElement, host);
}, "focus() on host with delegatesFocus, all tabindex=0");

test(() => {
  resetTabIndexAndFocus();
  setAllTabIndex(0);
  setTabIndex([host], -1);
  // First focusable = #aboveSlots
  host.focus();
  assert_equals(shadowRoot.activeElement, aboveSlots);
  assert_equals(document.activeElement, host);
}, "focus() on host with delegatesFocus & tabindex =-