[details-toggle-source.html]
  [ToggleEvent.source on <details> elements: details.open.]
    expected: FAIL

  [ToggleEvent.source on <details> elements: click summary.]
    expected: FAIL

  [ToggleEvent.source on <details> elements: click details.]
    expected: FAIL

  [ToggleEvent.source on <details> elements: command invokers.]
    expected: FAIL