diff --git a/source b/source
index 37e4bf8859d..802beefe890 100644
--- a/source
+++ b/source
@@ -62099,12 +62099,8 @@ interface <dfn interface>HTMLDialogElement</dfn> : <span>HTMLElement</span> {
    <li><p>If <var>this</var> does not have an <code data-x="attr-dialog-open">open</code>
    attribute, then return.</p></li>
 
-   <li><p>If <var>this</var>'s <span>computed closed-by state</span> is
-   <span data-x="attr-dialog-closedby-none-state">None</span>, then throw an
-   <span>"<code>InvalidStateError</code>"</span> <code>DOMException</code>.</p></li>
-
-   <li><p><span>Assert</span>: <var>this</var>'s <span data-x="dialog-close-watcher">close watcher</span>
-   is not null.</p></li>
+   <li><p><span>Assert</span>: <var>this</var>'s <span data-x="dialog-close-watcher">close
+   watcher</span> is not null.</p></li>
 
    <li><p>If <var>returnValue</var> is not given, then set it to null.</p></li>