[HTMLElement-attachInternals.html]
  [Successful attachInternals() and the second call.]
    expected: FAIL

  [attachInternals() throws a NotSupportedError if it is called for a customized built-in element]
    expected: FAIL

  [If a custom element definition for the local name of the element has disable internals flag, throw a NotSupportedError]
    expected: FAIL

  [If a custom element definition for the local name of the element doesn't exist, throw an InvalidStateError]
    expected: FAIL

  [If a custom element definition for the local name of the element doesn't exist, throw an NotSupportedError]
    expected: FAIL