Re: [dom] Fix the set an attribute algorithm (#139)

> @@ -5194,10 +5217,9 @@ To <dfn export id=concept-element-attributes-set>set an attribute</dfn> given an
>  
>   <li><p>If <var>oldAttr</var> is <var>attr</var>, return <var>attr</var>.
>  
> - <li><p>If <var>oldAttr</var> is non-null, <a lt="remove an attribute">remove</a> it from
> - <var>element</var>.
> -
> - <li><p><a lt="append an attribute">Append</a> <var>attr</var> to <var>element</var>.
> + <li><p>If <var>oldAttr</var> is non-null, <a lt="replace an attribute">replace</a> it
> +  by <var>attr</var> in <var>element</var>. Otherwise <a lt="append an attribute">append</a>
> +  <var>attr</var> to <var>element</var>.

The otherwise can still be its own step. "Otherwise, append _attr_ to _element_."

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