Re: [whatwg/dom] [DRAFT] Propagate events into the event's source's tree where appropriate. (PR #1377)

alice left a comment (whatwg/dom#1377)

AIUI `source` in this instance would be the `<button>`, but the problem @keithamus describes would occur because the event would be propagated out of the shadow tree for that reason (as it would also be for a `composed` event), and the event would appear to be originating from the shadow host rather than the element it actually originates on.

`referenceTarget` plays into this issue because it allows `<button>` to be the `source` for an event fired on an event inside shadow root even without manually firing the event as in Keith's example:


```html
<button id=b popoverTarget=popoverA>Click me</button>
<!-- even though popoverA has the popover attribute, b refers to popoverB -->
<div id=popoverA popover>
  <template shadowrootmode=open shadowRootReferenceTarget=popoverB>
    <div id=popoverB popover> <!-- an event fired here appears to come from popoverA -->
    </div>
  </template>
</div>
```

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