Re: [w3c/webcomponents] In Shadow DOM v1, tabIndex=-1 makes all elements inside the shadow tree to be no tab-focusable (#774)

It seems wrong that it would be impossible to make a custom element programmatically focusable and not in the user tab flow, without removing the entire shadow tree from tab flow.

If I explicitly set `delegateFocus` on the component, I’d expect the tabIndex value to propagate down the shadow tree because I explicitly told it to, but not implicitly delegateFocus down the shadow tree.

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