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| PASS setAttribute and removeAttribute must enqueue and invoke attributeChangedCallback |
| PASS setAttributeNS and removeAttributeNS must enqueue and invoke attributeChangedCallback |
| PASS setAttributeNode and removeAttributeNode must enqueue and invoke attributeChangedCallback for an HTML attribute |
| PASS setAttributeNode and removeAttributeNS must enqueue and invoke attributeChangedCallback for an SVG attribute |
| PASS toggleAttribute must enqueue and invoke attributeChangedCallback |
| PASS Mutating attributeChangedCallback after calling customElements.define must not affect the callback being invoked |
| PASS attributedChangedCallback must not be invoked when the observed attributes does not contain the attribute |
| PASS Mutating observedAttributes after calling customElements.define must not affect the set of attributes for which attributedChangedCallback is invoked |
| PASS attributedChangedCallback must be enqueued for attributes specified in a non-Array iterable observedAttributes |
| PASS attributedChangedCallback must be enqueued for style attribute change by mutating inline style declaration |
| PASS attributedChangedCallback must not be enqueued when mutating inline style declaration if the style attribute is not observed |
| PASS Upgrading a parser created element must enqueue and invoke attributeChangedCallback for an HTML attribute |
| PASS Upgrading a cloned element must enqueue and invoke attributeChangedCallback for an HTML attribute |
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