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The **`HTMLUnknownElement`** interface represents an invalid HTML element and derives from the {{DOMxRef("HTMLElement")}} interface, but without implementing any additional properties or methods.
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## Instance properties
_No specific property; inherits properties from its parent, {{DOMxRef("HTMLElement")}}._
## Instance methods
_No specific method; inherits methods from its parent, {{DOMxRef("HTMLElement")}}._