Re: [webcomponents] Proposed change for Focus Navigation (#381)

> +          forms its <a>control group</a>.
> +        </p>
> +
> +        <p>For a given <a>shadow root</a>, its <a>sequential focus navigation order</a> consists of
> +          <a data-lt="focusable area">focusable areas</a> in its <a>shadow tree</a>
> +          except descendants of a <a>shadow host</a>.
> +          The order is tree order.
> +        </p>
> +
> +        <p>For a given <a>slot</a> element,
> +          its <a>sequential focus navigation order</a> consists of
> +          <a data-lt="focusable area">focusable areas</a> of its <a>assigned nodes</a>
> +          and descendants of the <a>assigned nodes</a>.
> +          If a given slot's assigned nodes is empty, its
> +          <a>sequential focus navigation order</a> consists of
> +          <a data-lt="focusable area">focusable areas</a> of its fallback contents.

Fallback contents are not well defined.
Also do not forget that <slot> can be a descendant of another <slot>.


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