Re: [whatwg/dom] Add relatedTarget to event dispatch (#281)

> @@ -639,10 +639,18 @@ dictionary EventInit {
>  <p>An {{Event}} object is simply named an <dfn export id=concept-event>event</dfn>. It allows for
>  signaling that something has occurred, e.g., that an image has completed downloading.</p>
>  
> +<p>An <a>event</a> has an associated <dfn export for=Event>relatedTarget</dfn> (an
> +{{EventTarget}} object). Unless stated otherwise it is null.</p>
> +
> +<p>An <a>event</a> has an associated <dfn export>set the relatedTarget</dfn> algorithm,
> +which takes an {{EventTarget}} <var>relatedTarget</var>. Unless specified otherwise it does
> +nothing.</p>

So this algorithm exists because UI events need it and they need to do something different between normal UI events and Touch events?

Also, how does this work for synthetic events? I guess the event class defines it?

It's probably worth having a note here that points to the various implementations of this algorithm.

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