Re: [whatwg/dom] A faster way to find open shadow roots (or shadow hosts) (#665)

After mulling this over, we wonder if something patterned after the existing document collections could work? 
E.g., we have `document.scripts`, `document.links` (which finds all anchors with an href); something like `document.shadowHosts` (which could return all elements with a shadowRoot property that is non-null and open). 
Though this would probably not work recursively if that is a necessary use case...

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