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

A control group is more upper layer concept, isn't it?

I mean:

- There is 1 : N relationship between [a control group] and [focus navigation order in each scope].
- There is 1 : 1 relationship between [a control group] and [*global* focus navigation order], which is the result of *merging* multiple [focus navigation order in each scope].


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