Re: [dom] Fixes #156. Add legacy event type check to invoke algorithm. (#168)

>  
> +  <li><p>If <var>listener</var>'s <b>passive</b> is true, set <var>event</var>'s
> +  <a>in passive listener flag</a>.
> +
> +  <li><p>Call <var>listener</var>'s <b>callback</b>'s {{EventListener/handleEvent()}}, with
> +  <var>event</var> as argument and <var>event</var>'s {{Event/currentTarget}} attribute value as
> +  <a>callback this value</a>. If this throws any exception, <a>report the exception</a>.
> +
> +  <li><p>Clear <var>event</var>'s <a>in passive listener flag</a>.

While you're here, please s/Clear/Unset/.

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