diff --git a/source b/source
index 3bf945f0670..e5b8544c231 100644
--- a/source
+++ b/source
@@ -95844,8 +95844,7 @@ interface <dfn>MessagePort</dfn> : <span>EventTarget</span> {
   // event handlers
   attribute <span>EventHandler</span> <span data-x="handler-MessagePort-onmessage">onmessage</span>;
   attribute <span>EventHandler</span> <span data-x="handler-MessagePort-onmessageerror">onmessageerror</span>;
-<!--ILLFATED  attribute <span>EventHandler</span> <span data-x="handler-MessagePort-onerror">onerror</span>;
--->};</pre>
+};</pre>
 
   <dl class="domintro">
 
@@ -96101,55 +96100,6 @@ interface <dfn>MessagePort</dfn> : <span>EventTarget</span> {
   disentangle the two ports. If the method is called on a port that is not entangled, then the
   method must do nothing.</p>
 
-<!--ILLFATED (search for '- -')
-  <hr>
-
-  <p>In some circumstances, an entangled <code>MessagePort</code> <var>source port</var>
-  that is not <a href="#ports-and-garbage-collection">eligible for garbage collection</a> will
-  nonetheless find itself prematurely destroyed, for example if the user manually terminates the
-  user agent's host process. Under such circumstances, user agents should attempt to following these
-  steps:</p>
-
-  <!- - don't fire this for navigation, it would break bfcache - ->
-  <!- - for consistency, we don't fire this for worker termination - ->
-  <!- - we don't fire it on .close() because that would let you probe GC behavior also - ->
-
-  <ol>
-
-   <li><p>Let <var>target port</var> be the port with which the ill-fated <var>source port</var> is entangled.</p></li>
-
-   <li><p>If there is no <var>target port</var> (i.e. if <var>source port</var>
-   is not entangled), or if <var>target port</var> is suffering the same fate as <var>source port</var> (e.g. if both ports are in the same host process), then abort these
-   steps.</p></li>
-
-   <li><p>Mark <var>target port</var> as being a <dfn>related to an ill-fated
-   port</dfn>.</p></li>
-
-   <li><p>Create a <span data-x="concept-task">task</span> that <span
-   data-x="concept-event-fire">fires an event</span> named <code data-x="event-error">error</code>
-   at <var>target port</var>, and add the <span data-x="concept-task">task</span> to the <span>port
-   message queue</span> of <var>target port</var>. If the <var>new port</var>'s <span
-   data-x="concept-port-owner">owner</span> specifies a <span>responsible event loop</span> that is
-   a <span>browsing context</span> <span>event loop</span>, the <span
-   data-x="concept-task">task</span> must be associated with the <span>responsible document</span>
-   specified by <var>source port</var>'s <span
-   data-x="concept-port-owner">owner</span>.</p></li>
-
-   <!- - X X X if this port can ever itself be transferred, we should update the previous step to
-   fire the event not on the current target port, but on the port of the port message queue it finds
-   itself on when executed - - >
-
-   <li><p>Disentangle the two ports.</p></li>
-
-  </ol>
-
-  <p class="note">This does not happen if the port is garbage collected or closed using the <code
-  data-x="dom-messageport-close">close()</code> method. It is intended only as a way for Web
-  applications that operate across multiple browser processes (e.g. using workers or communicating
-  across multiple tabs) to gracefully handle a catastrophic failure in one process. A strictly
-  conforming user agent would never fail unexpectedly, and thus would never send this event!</p>
--->
-
   <hr>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
@@ -96163,8 +96113,7 @@ interface <dfn>MessagePort</dfn> : <span>EventTarget</span> {
    <tbody>
     <tr><td><dfn><code data-x="handler-MessagePort-onmessage">onmessage</code></dfn> <td> <code data-x="event-message">message</code>
     <tr><td><dfn><code data-x="handler-MessagePort-onmessageerror">onmessageerror</code></dfn> <td> <code data-x="event-messageerror">messageerror</code>
-<!--ILLFATED    <tr><td><dfn><code data-x="handler-MessagePort-onerror">onerror</code></dfn> <td> <code data-x="event-error">error</code>
--->  </table>
+  </table>
 
   <p>The first time a <code>MessagePort</code> object's <code
   data-x="handler-MessagePort-onmessage">onmessage</code> IDL attribute is set, the port's <span>port