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

> @@ -5151,6 +5151,29 @@ run these steps:
>   <li>An <a>attribute is removed</a>.
>  </ol>
>  
> +To <dfn export id=concept-element-attributes-replace lt="replace an attribute">replace</dfn> an
> +<a>attribute</a> <var>old attribute</var> by an <a>attribute</a> <var>new attribute</var>

oldAttr / newAttr.

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