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

>  
> -   <li><p>If <var>event</var>'s {{Event/eventPhase}} attribute value is {{Event/CAPTURING_PHASE}}
> -   and <var>listener</var>'s <b>capture</b> is false, terminate these substeps (and run them for the
> -   next <a>event listener</a>).
> +   <li>
> +    <p>If <var>event</var>'s {{Event/type}} attribute value is an <a>ASCII case-insensitive</a>

ASCII case-insensitive seems like copypasta.

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