[CustomElementRegistry.html]
  [customElements.define must get callbacks of the constructor prototype]
    expected: FAIL

  [customElements.define must rethrow an exception thrown while getting callbacks on the constructor prototype]
    expected: FAIL

  [customElements.define must rethrow an exception thrown while converting a callback value to Function callback type]
    expected: FAIL

  [customElements.define must get "observedAttributes" property on the constructor prototype when "attributeChangedCallback" is present]
    expected: FAIL

  [customElements.define must rethrow an exception thrown while getting additional formAssociated callbacks on the constructor prototype]
    expected: FAIL

  [customElements.define must get four additional callbacks on the prototype if formAssociated is converted to true]
    expected: FAIL

