Re: [w3c/webcomponents] CSS Modules (#759)

> It does seem that ownerNode would also be problematic, so not being 1:1 with documents might have a lot of gotchas that would need to be thought through. Having said that, ownerNode would also be problematic for reuse across shadow roots?

In the case of constructed stylesheets, the `ownerNode` is null and we have not encountered any problems yet with reusing it across shadow roots, as long as it is in the same document tree.

For imported stylesheets, what if we do this: `ownerNode` to null, and it can only be used in the document tree where the script is run on.

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