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

An alternative solution is to walk up `offsetParent` enough to find the first offset parent that is [unclosed node](http://w3c.github.io/webcomponents/spec/shadow/#dfn-unclosed-node) to the context object.

This is probably a better fix since authors won't be able to determine the location of an element which is assigned to a slot otherwise.

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