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":

Maybe it's better to make this more DRY and say something like if value is one of "animationend", "animationiteration", "animationstart", "transitionend"...

Let <var>original event type</var> be "animationstart"
Change event type to "webkit" + <var>original event type</var>

Or something like that.

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