Re: [whatwg/dom] Correct setting of target and relatedTargets post-dispatch (#585)

hayatoito commented on this pull request.



>      </ol>
 
-   <li><p>Otherwise, if <var>parent</var> and <var>relatedTarget</var> are identical, then set
-   <var>parent</var> to null.
+   <li><p>Otherwise, if <var>relatedTargets</var> <a for=list>contains</a> <var>parent</var>, then
+   set <var>parent</var> to null.

I would love to help to write more tests, though I'm afraid I can write tests only for synthetic TouchEvents. I am not sure how to write a test for non-synthetic TouchEvents.

> (The alternative option is that we keep one slot but branch on event interface, but that seems a little icky, but let me know if you'd prefer that.)

I don't have any preference.

btw, I am wondering how these *relatedTargets* will be used in TouchEvent spec.
TouchEvents has 3 *relatedTargets* lists.

```
    readonly        attribute TouchList touches;
    readonly        attribute TouchList targetTouches;
    readonly        attribute TouchList changedTouches;
```

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