Re: [w3c/webcomponents] Add delegatesFocus to the spec (#455)

> @@ -1117,6 +1117,20 @@
>        </section>
>  
>        <section>
> +        <h3>Focus</h3>
> +        <p>A <a>shadow host</a> can delegate focus to its <a>shadow root</a> by assigning a boolean <a href="#widl-ShadowRootInit-delegatesFocus">delegatesFocus</a> flag to be true in <a href="#idl-def-ShadowRootInit">ShadowRootInit</a> dictionary. If omitted, a <a>shadow host</a> does not delegate focus to its shadow root, and the shadow host itself can be focusable.</p>
> +        <p>When a shadow host delegates focus, user agent <strong>must</strong> behave as follows.
> +          <ol>
> +            <li>When the <a>shadow host</a> is being focused by TAB focus navigation: if the direction is forward, the first focusable element in its <a>shadow tree</a> gets focuse. If the direction is backward, the last focusable element in its <a>shadow tree</a> gets focuse. If there is no focusable element in its <a>shadow tree</a>, the <a>shadow host</a> is skipped for the navigation. See the next secition for the formal definition.</li>

Is this duplication? This is explained in the next section, I think.

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