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

> @@ -1057,6 +1096,25 @@ invoked, must run these steps:
>   <li><p><a>Dispatch</a> the <var>event</var> and return the value that returns.
>  </ol>
>  
> +<h3 id=observing-event-listeners>Observing event listeners</h3>
> +In general, developers do not expect the presence of an <a>event listener</a> to be

Use a newline after `<h3>` and an additional newline before the `<h3>`.

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