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

@LeaVerou commented on this pull request.



> @@ -3442,6 +3444,19 @@ dictionary MutationObserverInit {
    <a>attribute</a> mutations need to be
    observed and {{MutationObserverInit/attributes}} is true
    or omitted.
+
+   <dt>{{MutationObserverInit/elementByAttributeFilter}}
+   <dd>Set to a list of <a>attribute</a>
+   <a for=Attr>local names</a> (without <a for=Attr>namespace</a>) to observe changes
+   to the presence of an elements <a>attributes</a>.

```suggestion
   to the presence of an element's <a>attributes</a>.
```

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