Re: [webcomponents] Event path trimming should only happen for mouseover and mouseout (#330)

If we (in some off chance) were to keep the currently spec'ed behavior, then the following text belongs to an informative note, not a normative text since this trimming behavior applies to all trusted events.
> to avoid the appearance of spurious `mouseover` and `mouse out` events firing from the same node

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https://github.com/w3c/webcomponents/issues/330#issuecomment-143503097