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

The problem here is that `super()` must be made from your custom element to `HTMLElement`'s constructor, and `HTMLElement`'s constructor has no way of knowing inside which context the element was created when `new MyForm` is called.  See discussions in https://github.com/w3c/webcomponents/issues/369.

It is possible that we can extend the existing API to allow this use case by adding `createElement` which sets a special flag on the construction stack to indicate that a given custom element belongs to a specific shadow tree but this would mean that `new MyForm` wouldn't work for such custom elements.

---
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/webcomponents/issues/488#issuecomment-228501557