Re: [w3ctag/design-reviews] Reference Target (Issue #961)

@jyasskin @dandclark 
> @LeaVerou Check out how `aria-labelledby` and `aria-describedby` can say that an element is labeled or described by multiple other elements. It is an edge case, but it has to be supported somehow.

I know that, but it seems like as long as each of these ids is delegated properly, this should just work? Oh I see, you're saying you want to delegate each reference to the CE to _multiple_ elements within its shadow root. In that case, the approach of specifying the attribute on the element seems to work even better: for attributes only taking a single idref the first one wins, for attributes taking multiple, *all* elements declaring a mapping are taken into account. You both seem to be saying that the order of ids is significant, but I can't find anything in the ARIA spec that says so, are we sure that's the case?

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