[popover-toggle-source.html]
  [ToggleEvent.source on popover elements: showPopover() without source.]
    expected:
      if not asan and not tsan: PASS
      [PASS, FAIL]

  [ToggleEvent.source on popover elements: showPopover() with source.]
    expected:
      if not asan and not tsan: PASS
      [PASS, FAIL]

  [ToggleEvent.source on popover elements: Calling click() on a popovertarget button.]
    expected:
      if not asan and not tsan: PASS
      [PASS, FAIL]