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@@ -9375,7 +9375,7 @@ partial interface <dfn id="document" data-lt="">Document</dfn> {
   <p>The <code>Document</code> has a <dfn data-dfn-for="Document"
   data-x="concept-document-coop">cross-origin opener policy</dfn>, which is a
   <span data-x="cross-origin-opener-policy">cross-origin opener policy</span>,
-  initially "<code data-x="">unsafe-none</code>.</p>
+  initially "<code data-x="">unsafe-none</code>".</p>
 
   <h4>The <code>DocumentOrShadowRoot</code> interface</h4>
 
@@ -79912,8 +79912,10 @@ console.assert(iframeWindow.frameElement === null);
   for collecting agent clusters when it is deemed that nothing can access them anymore.</p>
 
   <p>A <span>browsing context group</span> has a <dfn data-x="cross-origin-isolated">cross-origin
-  isolated</dfn> boolean. It is initially false. When it is true, the <span>agent cluster map</span>
-  will be keyed using <span data-x="origin">origins</span>.</p>
+  isolated</dfn> boolean. It is initially false.</p>
+
+  <p class="XXX"> The impact of <span data-x="cross-origin-isolated">cross-origin isolated</span> is
+  under discussion in <a href="https://github.com/whatwg/html/pull/4734">issue #4734</a>.</p>
 
   <p>To <dfn data-x="creating a new browsing context group">create a new browsing context
   group</dfn>, run these steps:</p>
@@ -80223,10 +80225,15 @@ console.assert(iframeWindow.frameElement === null);
          <li><p>Let <var>currentDocument</var> be <var>current</var>'s
          <span>active document</span>.</p> </li>
 
-         <li><p>If <var>currentDocument</var>'s <span>origin</span> is not <span>same origin</span>
-         with <var>current</var>'s <span>top-level browsing context</span>'s
-         <span>active document</span> 's <span>origin</span>, then set <var>noopener</var> to
-         true.</p></li>
+         <li>
+          <p>If <var>currentDocument</var>'s <span>origin</span> is not <span>same origin</span>
+          with <var>current</var>'s <span>top-level browsing context</span>'s <span>active
+          document</span> 's <span>origin</span>, then set <var>noopener</var> to true and
+          <var>name</var> to "<code data-x="">_blank</code>".</p>
+
+          <p class="note">In the presence of COOP, nested documents cross-origin with their
+          top-level browsing context always set /noopener/.</p>
+         </li>
         </ol>
        </li>
 
@@ -82922,6 +82929,10 @@ interface <dfn>BarProp</dfn> {
    <li><p>Return <var>newBrowsingContext</var>.</p></li>
   </ol>
 
+  <p class="XXX">The impact of swapping browsing context groups following a navigation is not
+  defined. It is currently under discussion in <a
+  href="https://github.com/whatwg/html/issues/5350">issue 5350</a>.</p>
+
   <h3 split-filename="history" id="history">Session history and navigation</h3>
 
   <h4>The session history of browsing contexts</h4>