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

@smaug---- commented on this pull request.



> +      <p>If none of the following are true
+
+      <ul class=brief>
+       <li><var>options</var>'s {{MutationObserverInit/elementFilter}} is present, and the
+       <a>node</a>'s <var>localName</var> is in {{MutationObserverInit/elementFilter}}
+
+       <li><var>options</var>'s {{MutationObserverInit/elementByAttributeFilter}} is present, and
+       <var>options</var>'s {{MutationObserverInit/elementByAttributeFilter}} contains any of the
+       attribute names in <var>nodeAttributesList</var>
+      </ul>
+
+      <p>then <a for=list>append</a> <var>node</var> to <var>filterRemovedNodes</var>.
+    </ol>
+
+   <li><p>Assert: either <var>filteredAddedNodes</var> or <var>filteredRemovedNodes</var>
+   <a for=set>is not empty</a>.

How can we assert this?

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