Re: [WICG/webcomponents] Creating non-ugraded defined custom element : `createElement(tagname, {upgrade:false})` (Issue #1097)

denis-migdal left a comment (WICG/webcomponents#1097)

> I don't think `HTMLUnknownElement` is ever used for something that has a valid custom element name (and is in the correct namespace)?

Indeed, I may have misread the MDN documentation.

It seems the best way would then to use `elem.constructor.name === "HTMLElement"` to check if an element has been upgraded.

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