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| 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 |
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