| CONSOLE MESSAGE: Exception thrown as a part of test |
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| PASS Upgrading a custom element must enqueue attributeChangedCallback on each attribute |
| PASS Upgrading a custom element not must enqueue attributeChangedCallback on unobserved attributes |
| PASS Upgrading a custom element must enqueue connectedCallback if the element in the document |
| PASS Upgrading a custom element must enqueue attributeChangedCallback before connectedCallback |
| PASS Upgrading a custom element must not invoke attributeChangedCallback and connectedCallback when the element failed to upgrade |
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