FYI, I tried gathering some author feedback [via Twitter poll](https://mobile.twitter.com/AmeliasBrain/status/1052003947177697281). Didn't get a lot of responses, but the expectation seems to be that `<use href="#svg" clip-path="#web"/>` should look for those references in the same shadow tree, possibly falling back to searching parent trees if there is no match in the shadow.
> Web dev nerds! It's poll time again!
>
> If you're using a shadow-DOM web component, and an element includes a # url reference, like:
> `<use href="#svg" clip-path="#web"/>`
>
> Where would you expect the browser to look for the element with that `id` value?
>
> (IDs are only unique per tree)
>
> - Only in that shadow tree
> 53%
> - Only in the main document
> 12%
> - Search shadow, then main
> 30%
> - Something else (reply)
> 5%
>
> 43 votes ยท Final results
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