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

> @@ -349,6 +343,42 @@
>      </section>
>  
>      <section>
> +      <h2>Extensions to the <a>DocumentOrShadowRoot</a> Mixin</h2>
> +
> +      <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

I recommend you to use a retargeting algorithm as is so that we do not have a lot of specilized retargeting algorithms.
I am afraid that we will have a maintanace burden.

I think your definition works here because it is for DocumentOrShadowRoot, and it is for Pointer locked element.
If one of these assumption breaks, your definition will not work.
I have to review your definition carefully here...
 e.g. The case where the target's root is neither Document nor ShadowRoot. Have you considered this case??

I prefer having one algorithm, and we should refer it from everywhere if we can apply it, instead of customizing it in many places.


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