Re: [whatwg/dom] Add new mutation observer init options elementFilterByAttribute and elementLocalNameFilter (#885)

@rniwa commented on this pull request.



> @@ -3594,6 +3625,60 @@ run these steps:
 <ol>
  <li><p>Assert: either <var>addedNodes</var> or <var>removedNodes</var> <a for=set>is not empty</a>.
 
+ <li><p>If either <var>options</var>'s' {{MutationObserverInit/elementLocalNameFilter}} or
+ {{MutationObserverInit/elementHasAttributeNameFilter}} is present, then:
+
+ <ol>
+  <li><p>Let <var>nodeAttributesList</var> be <var>nodeAttributesList</var> of the node's attributes, "<code>node.getAttributeNames()</code>".

No, these normative text shouldn't be written as JavaScript or invoking other DOM API. We should probably just say Let nodeAttributesList be the set of local names of node's attributes. 

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