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 of <var>target</var> and repeat the following substeps:

Updated to use "A's root's host" instead of "A's shadow host".

The precondition requires "the target is in the shadow-including descendant of the context object", i.e. if the context's root is not the same as the target's, the target's root must be a shadow root.

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