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| PASS Upgrading a custom element must invoke attributeChangedCallback and connectedCallback before start upgrading another element |
| PASS Upgrading a custom element must not invoke attributeChangedCallback for the attribute that is changed during upgrading |
| PASS Mutating a undefined custom element while upgrading a custom element must not enqueue or invoke reactions on the mutated element |
| PASS Mutating another custom element inside adopted callback must invoke all pending callbacks on the mutated element |
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