backlink dom#1328 to the CommandEvent source getter steps

source

@@ -79941,6 +79941,11 @@ dictionary <dfn dictionary>CommandEventInit</dfn> : <span>EventInit</span> {
   data-x="dom-CommandEvent-source">source</code> against <var>this</var>'s <code
   data-x="dom-Event-currentTarget">currentTarget</code>.</p>
 
+  <p class="XXX"><a href="https://github.com/whatwg/dom/issues/1328">Issue #1328</a> tracks how to
+  better standardize associated event data in a way which makes sense on Events. Currently an event
+  attribute initialized to a value cannot also have a getter, and so an internal slot (or map of
+  additional fields) is required to properly specify this.</p>
+
   <h3>Focus</h3>
 
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