[template.window.html]
  [shadowRootCustomElementRegistry reflects as string]
    expected: FAIL

  [A declarative shadow root gets its default registry from its node document]
    expected: FAIL

  [Serializing a null registry ShadowRoot with a global registry host (document)]
    expected: FAIL

  [Serializing a scoped registry ShadowRoot with a global registry host (document)]
    expected: FAIL

  [Serializing a scoped registry ShadowRoot with a null registry host (document)]
    expected: FAIL

  [Serializing a null registry ShadowRoot with a scoped registry host (document)]
    expected: FAIL

  [Serializing a scoped registry ShadowRoot with a scoped registry host (document)]
    expected: FAIL