Re: [w3c/webcomponents] Is the order of `slotchange` events along a slot chain across node trees defined? (#617)

This has been changed. Right now, a single `slotchange` event would be dispatched at the “shallowest” slot which is assigned to “deeper” slots.  Note that mutation observers are the first to be informed because the step to [notify mutation observers](https://dom.spec.whatwg.org/#notify-mutation-observers) first invokes mutation observers before firing any `slotchange` events.

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