e], 0);
  // Structure:
  // <div #host> (delegatesFocus=true) tabindex=0
  //    #shadowRoot
  //      <div #aboveSlots>
  //      <slot #firstSlot>
  //        (slotted) <div #slottedToFirstSlot>
  //      <slot #secondSlot>
  //        (slotted) <div #slottedToSecondSlot>
  //      <div #belowSlots>
  // <div #outside> tabindex=0
  // No focusable element under #host in the flat tree.
  host.focus();
  assert_equals(shadowRoot.activeElement, null);
  assert_equals(document.activeElement, document.body);
