Re: [w3c/webcomponents] Fix #556, make focus navigation work when shadow host's tabindex is -1 (#557)

>                    </ol>
> -                <li>Reorder <var>NAVIGATION-ORDER</var> according to the <a>tabindex</a> value attached to each node. In this step, an element whose <a>tabindex</a> value is negative <strong>must</strong> not be appended to <var>NAVIGATION-ORDER</var>.</li>
> +                <li>Reorder <var>NAVIGATION-ORDER</var> according to the <a>tabindex</a> value attached to each node. In this step, a shadow host with negative <a>tabindex</a> value must be treated as if its <a>tabindex</a> value were 0.</li>

Could you have a link which explains how "Reorder" sort elements?

In the current definition, it looks that elements would be sorted by only "tabindex". No tie-breaker.
We should have a link to explain how these elements are sorted by tabindex and tree-order.



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