diff --git a/source b/source
index dfe695001ea..b8efb98695b 100644
--- a/source
+++ b/source
@@ -20973,6 +20973,11 @@ interface <dfn>HTMLHyperlinkElementUtils</dfn> {
 
    </li>
 
+   <li><p>If <var>subject</var>'s <a href="#linkTypes">link types</a> include the <code
+   data-x="rel-noreferrer">noreferrer</code> or <code data-x="rel-noopener">noopener</code> keyword,
+   and <var>replace</var> is true, then <span data-x="disowned its opener">disown
+   <var>target</var>'s opener</span>.</p></li>
+
    <li><p><span data-x="resolve a url">Resolve</span> the <span>URL</span> given by
    <var>subject</var>'s <code data-x="attr-hyperlink-href">href</code> attribute, relative to
    <var>subject</var>.</p></li>
@@ -21472,6 +21477,13 @@ interface <dfn>HTMLHyperlinkElementUtils</dfn> {
      <td>Requires that the user agent not send an HTTP `<code data-x="http-referer">Referer</code>` (sic) header if the user follows the hyperlink.</td>
     </tr>
 
+    <tr>
+     <td><code data-x="rel-noopener">noopener</code></td>
+     <td><em>not allowed</em></td>
+     <td><span data-x="hyperlink annotation">Annotation</span></td>
+     <td>Requires that any <span>browsing context</span> created by following the hyperlink must not have an <span>opener browsing context</span>.</td>
+    </tr>
+
     <tr>
      <td><code data-x="rel-pingback">pingback</code></td>
      <td><span data-x="external resource link">External Resource</span></td>
@@ -21985,14 +21997,29 @@ interface <dfn>HTMLHyperlinkElementUtils</dfn> {
   <span data-x="concept-request">request</span>'s <span
   data-x="concept-request-referrer">referrer</span> to "<code data-x="">no-referrer</code>".</p>
 
-  <p>This keyword also <a href="#noopener">causes the <code data-x="dom-opener">opener</code>
-  attribute to remain null</a> if the hyperlink <span data-x="creating a new browsing context">creates</span> a new <span>browsing context</span>.</p>
+  <p class="note">For historical reasons, the <code data-x="rel-noreferrer">noreferrer</code>
+  keyword implies the behavior associated with the <code data-x="rel-noopener">noopener</code>
+  keyword when present on a hyperlink that <span data-x="creating a new browsing
+  context">creates</span> a new <span>browsing context</span>. That is, <code data-x="">&lt;a
+  href="..." rel="noreferrer" target="_blank"&gt;</code> has the same behavior as <code
+  data-x="">&lt;a href="..." rel="noreferrer noopener" target="_blank"&gt;</code>.</p>
 
   </div>
 
   <!-- v2: Would be nice to apply this to other elements too, e.g. letting <img> or CSS or <video>
   hide the referrer -->
 
+  <h5>Link type "<dfn><code data-x="rel-noopener">noopener</code></dfn>"</h5>
+
+  <p>The <code data-x="rel-noopener">noopener</code> keyword may be used with <code>a</code> and
+  <code>area</code> elements. This keyword does not create a <span>hyperlink</span>, but <span
+  data-x="hyperlink annotation">annotates</span> any other hyperlinks created by the element (the
+  implied hyperlink, if no other keywords create one).</p>
+
+  <p>The keyword indicates that any newly created <span>browsing context</span> which results from
+  following the <span>hyperlink</span> will not have an <span>opener browsing context</span>, which
+  means that its <code data-x="dom-opener">window.opener</code> property will be <code
+  data-x="">null</code>.</p>
 
   <h5>Link type "<dfn><code data-x="rel-pingback">pingback</code></dfn>"</h5>
 
@@ -78394,33 +78421,19 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
 
 
      <dt id="noopener">If the user agent has been configured such that in this instance it will
-     create a new browsing context, and the browsing context is being requested as part of <span
-     data-x="following hyperlinks">following a hyperlink</span> whose <a href="#linkTypes">link
-     types</a> include the <code data-x="rel-noreferrer">noreferrer</code> keyword</dt>
-
-     <dd><p>A new <span>top-level browsing context</span> must be <span data-x="creating a new browsing context">created</span>. If the given browsing
-     context name is not <code data-x="">_blank</code>, then the new top-level browsing context's
-     name must be the given browsing context name (otherwise, it has no name). The chosen browsing
-     context must be this new browsing context. The creation of such a <span>browsing context</span>
-     is <dfn>a new start for session storage</dfn>.</p>
-
-     <p class="note">If it is immediately <span data-x="navigate">navigated</span>, then the
-     navigation will be done with <span>replacement enabled</span>.</p></dd>
-
-
-     <dt>If the user agent has been configured such that in this instance it will create a new
-     browsing context, and the <code data-x="rel-noreferrer">noreferrer</code> keyword doesn't
-     apply</dt>
-
-     <dd><p>A new <span>auxiliary browsing context</span> must be created, with the <span>opener
-     browsing context</span> being the current one. If the given browsing context name is not <code
-     data-x="">_blank</code>, then the new auxiliary browsing context's name must be the given
-     browsing context name (otherwise, it has no name). The chosen browsing context must be this new
-     browsing context.</p>
-
-     <p class="note">If it is immediately <span data-x="navigate">navigated</span>, then the
-     navigation will be done with <span>replacement enabled</span>.</p></dd>
+     create a new browsing context:</dt>
 
+     <dd>
+      <p>A new <span>auxiliary browsing context</span> must be created, with the <span>opener
+      browsing context</span> being the current one. If the given browsing context name is not
+      <code data-x="">_blank</code>, then the new auxiliary browsing context's name must be the
+      given browsing context name (otherwise, it has no name). The chosen browsing context must be
+      this new browsing context.</p>
+
+      <p class="note">If the newly created <span>browsing context</span> is immediately <span
+      data-x="navigate">navigated</span>, then the navigation will be done with <span>replacement
+      enabled</span>.</p>
+     </dd>
 
      <dt>If the user agent has been configured such that in this instance it will reuse the current
      browsing context</dt>
@@ -78826,8 +78839,23 @@ callback <dfn>FrameRequestCallback</dfn> = void (<span>DOMHighResTimeStamp</span
 
    </li>
 
-   <li><p><i>End</i>: Return the <code>WindowProxy</code> object of <var>target browsing
-   context</var>.</p></li>
+
+   <li>
+    <p><i>End</i>:</p>
+
+    <ol>
+
+     <li><p>If the result of <span data-x="split a string on commas">splitting <var>features</var>
+     on commas</span> contains the token "<code data-x="">noopener</code>", <span data-x="disowned
+     its opener">disown <var>target browsing context</var>'s opener</span>, and return <code
+     data-x="">null</code>.</p></li>
+
+     <li><p>Otherwise, return the <code>WindowProxy</code> object of <var>target browsing
+     context</var>.</p></li>
+
+    </ol>
+
+   </li>
 
   </ol>
 
@@ -118105,6 +118133,7 @@ INSERT INTERFACES HERE
   Charlene Wright,
   Charles Iliya Krempeaux,
   Charles McCathieNevile,
+  Charlie Reis,
   Chris Apers,
   Chris Cressman,
   Chris Evans,
@@ -118594,6 +118623,7 @@ INSERT INTERFACES HERE
   Sander van Lambalgen,
   Sanjoy Pal,
   Sarven Capadisli,
+  Scott Beardsley,
   Scott Gonz&aacute;lez,
   Scott Hess,
   Sean Fraser,