Re: [dom] Issue #156. Add legacy event type check to invoke algorithm. (#158)

> @@ -1217,7 +1217,32 @@ for discussion).
>     <a>invoke</a> algorithm.
>  
>     <li><p>If <var>event</var>'s {{Event/type}} attribute value is not <var>listener</var>'s
> -   <b>type</b>, terminate these substeps (and run them for the next <a>event listener</a>).
> +   <b>type</b>, check for a legacy type attribute match by running these substeps:
> +
> +   <ol>
> +    <li><p>If <var>event</var>'s {{Event/type}} attribute value is "animationend":
> +    <ol>
> +     <li><p>Let <var>original event type</var> be "animationend".
> +     <li><p>Change the <var>event</var>'s {{Event/type}} attribute value to "webkitanimationend".
> +    </ol>
> +    <li><p>If <var>event</var>'s {{Event/type}} attribute value is "animationiteration":
> +    <ol>
> +     <li><p>Let <var>original event type</var> be "animationiteration".
> +     <li><p>Change the <var>event</var>'s {{Event/type}} attribute value to "webkitanimationiteration".
> +    </ol>
> +    <li><p>If <var>event</var>'s {{Event/type}} attribute value is "animationstart":

If the `<li>` has multiple children they need to start on their own line and be indented with a space. (Also applies earlier and later. Put the comment here for some breathing room.)

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https://github.com/whatwg/dom/pull/158/files#r52137303