Re: [w3c/webcomponents] HTMLElement.prototype.offsetParent leaks a node inside a shadow tree (#497)

Sorry, it looks like I missed an crucial point in https://github.com/w3c/csswg-drafts/issues/159

We’re exposing any node that’s not closed-shadow-hidden here, which means we’d return an element inside shadow tree as an offset parent. I don’t think we want that even in an open shadow tree.

Let’s imagine you’re trying to traverse over ancestor offsetParents. Such a code would now walk over elements inside a shadow tree. I don’t think this is desirable just as much as finding nodes via querySelector or getElementsByTagName inside shadow trees are not desirable.

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