Re: [whatwg/dom] Shadow: Specify when `slotchange` fires (#447)

> I guess another option is to get rid of the suppression but fire slotchange event only when the slot is inside a shadow tree. Then we wouldn't fire a slotchange on a removed slot element since that's not in a shadow tree. That might make this event a lot easier to understand & reason.

That sounds reasonable option to me. +1 for that.

I would like to mention that there is a minor backward incompatibility:
- A slot which is not in a shadow tree no longer receive a slotchange even if we append a child to the slot. (it is known as *fallback content*)

However, I think we can ignore this case in practical. No one is interested in this case, I guess.

If someone is worrying about this backward incompatibility, please let us know that.





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