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

>  
>          <p>If a <a>node</a> doesn’t <a data-lt="participates">participate</a> in the <a>document flat tree</a>, the <a>node</a> <strong>must</strong> be skipped from the <a>sequential focus navigation</a>.</p>
>  
> -        <p>The <a>sequential focus navigation order</a> for a given <a>shadow tree</a> <var>A</var> <strong>must</strong> be inserted into the <a>sequential focus navigation order</a> for the <a>parent tree</a> <var>B</var> as follows:</p>
> +        <p>Each <a>shadow root</a> and <a>slot</a> element is a <a>control group owner</a> and

My understanding is that frames own its own control group (e.g. `<iframe>`) and its own sequence,  but from user's standpoint, tab navigation sequence look *global*.  Thus sequences for each group is merged.


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