diff --git a/source b/source
index 0960c0fb30e..e71af616481 100644
--- a/source
+++ b/source
@@ -131239,10 +131239,8 @@ document.body.appendChild(text);
       <p>If one of the following is true:</p>
 
       <ul>
-       <li><p><var>serializableShadowRoots</var> is true, <var>shadow</var>'s
-       <span data-x="shadow-serializable">serializable</span> is true, and <var>shadow</var>'s
-       <span data-x="concept-shadow-root-mode">mode</span> is "<code data-x="">open</code>";
-       or</p></li>
+       <li><p><var>serializableShadowRoots</var> is true and <var>shadow</var>'s
+       <span data-x="shadow-serializable">serializable</span> is true; or</p></li>
 
        <li><p><var>shadowRoots</var> contains <var>shadow</var>,</p></li>
       </ul>