diff --git a/source b/source
index e6c462593cb..4ae78ea2dd6 100644
--- a/source
+++ b/source
@@ -59127,6 +59127,8 @@ interface <dfn interface>HTMLSelectedContentElement</dfn> : <span>HTMLElement</s
   <ol>
    <li><p>Let <var>passedFirstSelectedcontent</var> be false.</p></li>
 
+   <li><p>Let <var>selectedcontentElements</var> be « ».</p></li>
+
    <li>
     <p>For each <var>descendant</var> of <var>select</var>'s <span
     data-x="descendant">descendants</span> in <span>tree order</span> that is a
@@ -59136,10 +59138,13 @@ interface <dfn interface>HTMLSelectedContentElement</dfn> : <span>HTMLElement</s
      <li><p>If <var>passedFirstSelectedcontent</var> is false, then set
      <var>passedFirstSelectedcontent</var> to true.</p></li>
 
-     <li><p>Otherwise, run <span>clear a <code>selectedcontent</code></span> given
-     <var>descendant</var>.</p></li>
+     <li><p>Otherwise, <span data-x="list append">append</span> <var>descendant</var> to
+     <var>selectedcontentElements</var>.</p></li>
     </ol>
    </li>
+
+   <li><p>For each <var>selectedcontent</var> of <var>selectedcontentElements</var>, <span>clear a
+   <code>selectedcontent</code></span> given <var>descendant</var>.</p></li>
   </ol>
   </div>