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| PASS Node.prototype.cloneNode(false) must be able to clone a custom element |
| PASS Node.prototype.cloneNode(false) must be able to clone as a autonomous custom element when it contains is attribute |
| FAIL Node.prototype.cloneNode(false) must be able to clone as a customized built-in element when it has an inconsistent "is" attribute assert_true: expected true got false |
| PASS Node.prototype.cloneNode(false) must be able to clone a custom element inside an iframe |
| PASS Node.prototype.cloneNode(true) must be able to clone a descendent custom element |
| PASS Node.prototype.cloneNode(true) must set parentNode, previousSibling, and nextSibling before upgrading custom elements |
| 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 TypeError when the custom element's constructor returns another element |
| PASS Inserting an element must not try to upgrade a custom element when it had already failed to upgrade once |
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