Re: [csswg-drafts] HTMLElement.prototype.offsetParent leaks a node inside a shadow tree

Sorry, it looks like I missed an crucial point here.

We’re exposing any node that’s not 
[closed-shadow-hidden](https://dom.spec.whatwg.org/#concept-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 `offsetParent`s.
  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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Received on Saturday, 10 December 2016 06:45:27 UTC