Re: [w3c/webcomponents] [idea] Allowing custom element registrations on per-shadow-root basis. (#488)

> Idea: what if registrations are loose? So, for example, `let myForm = new MyForm` just instantiates the element, but there is no tagName associated with it yet. When `myForm` gets attached into, for example, a shadow root with `MyForm` registered to the `my-form` tagName, then the instance gains that name while in that shadow node tree, and therefore selectors that target `my-form` within that node tree would properly target that instance.

That would be really hard to implement in browser engines.

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