Re: [WICG/webcomponents] Reference Target: Which attributes are in scope? (Issue #1091)

`<td>`/`<tr>` `headers` does seem like it should work, I guess we just missed that in the WPT coverage. Filed [crbug.com/383999373](https://issues.chromium.org/issues/383999373).

`itemref` should work in theory.

The one potential exception I was aware of was `aria-owns`. My understanding was that the intention of https://github.com/w3c/aria/issues/2266 was to specifically resolve against `aria-owns` working with reference target. I believe @aleventhal was concerned that the complexity of implementing cross-root `aria-owns` would outweigh any potential use case. Although based on your more recent conversation in that thread, it sounds like maybe there's a hope that this can eventually work after all? If `ariaOwnsElements` *can* be shipped successfully and allows cross-root `aria-owns` associations, then it seems like `aria-owns` with referenceTarget would not add significant complexity beyond that.

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