remove pre-insertion validity

source

@@ -56393,9 +56393,6 @@ interface <dfn interface>HTMLSelectedContentElement</dfn> : <span>HTMLElement</s
    <li><p>Let <var>documentFragment</var> be the result of running <span>convert nodes into a
    node</span> given <var>nodes</var> and <var>option</var>'s <span>node document</span>.</p></li>
 
-   <li><p><span>Ensure pre-insertion validity</span> of <var>documentFragment</var> into
-   <var>selectedContent</var> before null.</p></li>
-
    <li><p><span data-x="concept-node-replace-all">Replace all</span> with
    <var>documentFragment</var> within <var>selectedcontent</var>.</p></li>
   </ol>