Harness status: OK

Found 6 tests

6 Pass
Pass	Element.prototype.createElement must add an unresolved custom element to the upgrade candidates map
Pass	HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed due to a custom element constructor constructing itself after super() call
Pass	HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed due to a custom element constructor constructing itself before super() call
Pass	Upgrading a custom element must throw an TypeError when the returned element is not SameValue as the upgraded element
Pass	Upgrading a custom element whose constructor returns a Text node must throw
Pass	Upgrading a custom element whose constructor returns an Element must throw