Re: [w3c/pointerlock] Update for Shadow DOM (#4)

> +      <dl title='partial interface DocumentOrShadowRoot' class='idl'>
> +         <dt>readonly attribute Element? pointerLockElement</dt>
> +         <dd>
> +           <dfn title="pointerLockElement"></dfn>
> +
> +           <p>If the element, which is set as the target for mouse events while the pointer is
> +           locked, is a
> +           <a href="https://dom.spec.whatwg.org/#concept-shadow-including-descendant">shadow-including descendant</a> of the
> +           <a href="http://dom.spec.whatwg.org/#context-object">context object</a>,
> +           return the result of the following algorithm:
> +           <ol>
> +             <li>Let <var>target</var> be the target for mouse events while the pointer is locked.
> +             <li>If <var>target</var> is in the same tree as the
> +               <a href="http://dom.spec.whatwg.org/#context-object">context object</a>,
> +               let <var>adjusted-target</var> be <var>target</var></li>
> +             <li>Otherwise: let <var>adjusted-target</var> be the shadow host which is a

I thought that 

- there should be one shadow host that matches the conditions, so "THE shadow host"
- which meets both of the following conditions (AND condition):
    - "A shadow-including ancestor" of target (because there can be multiple ancestor shadow hosts), and
    - is "in THE same tree" as the context object (this should filter only one in the same tree)

therefore I can use "THE shadow host" here.
I'll ask some native speaker around.

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