Re: [dom] Add EventListenerOptions and passive event listeners (#82)

> @@ -1058,6 +1110,32 @@ invoked, must run these steps:
>  </ol>
>  
>  
> +<h3 id=observing-event-listeners>Observing event listeners</h3>
> +
> +<p>In general, developers do not expect the presence of an <a>event listener</a> to be
> +observable.  The impact of an <a>event listener</a> is determined by its <b>callback</b>.

Throughout, there should only be a single space after a period.

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