Re: [w3c/webcomponents] The get-the-parent algorithm shouldn't return null until we reach the root of the current tree (#577)

Thanks. Let me update the spec.

BTW, I have found another (orthogonal) bug in the spec.

For example, when a mouse pointer moves from an element in a shadow tree to its shadow host,
a "mouseover" event should not be dispatched on the shadow host. In this case, the event path should be empty. However, the current spec allows a non-empty event path. That's an unintentional bug to me. Let me fix these together.


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