Re: [w3ctag/design-reviews] HTMLPopupElement (#680)

There is precedent in the Web Platform for having an abstract base class with shared API and subclasses that correspond to specific tag names: `HTMLMediaElement` contains the shared behaviors between `<audio>` and `<video>`, whereas the base class does not correspond to a tag name, because it cannot be used directly. I wonder if a similar architecture would be more appropriate here than introducing a new element with no concrete semantics?

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