Consider pointerup and touchend for "triggered by user activation"

Although there are larger issues with this definition (see whatwg#1358), the
specific lack of these events was causing implementation confusion, so
they are worth adding before fixing the definition more generally.

source

@@ -3229,6 +3229,13 @@ a.setAttribute('href', 'http://example.com/'); // change the content attribute d
     <ul class="brief">
      <li><dfn data-x-href="https://w3c.github.io/touch-events/#touch-interface"><code>Touch</code></dfn> interface</li>
      <li><dfn data-x-href="https://w3c.github.io/touch-events/#dfn-touch-point">Touch point</dfn> concept</li>
+     <li><dfn data-x="event-touchend" data-x-href="https://w3c.github.io/touch-events/#event-touchend"><code>touchend</code></dfn> event</li>
+    </ul>
+
+    <p>The following features are defined in the Pointer Events specification: <ref spec=POINTEREVENTS></p>
+
+    <ul class="brief">
+     <li><dfn data-x="event-pointerup" data-x-href="https://w3c.github.io/pointerevents/#the-pointerup-event"><code>pointerup</code></dfn> event</li>
     </ul>
 
     <p>This specification sometimes uses the term <dfn data-x="">name</dfn> to refer to the event's
@@ -72363,8 +72370,10 @@ END:VCARD</pre>
      <li><code data-x="event-click">click</code></li>
      <li><code data-x="event-dblclick">dblclick</code></li>
      <li><code data-x="event-mouseup">mouseup</code></li>
+     <li><code data-x="event-pointerup">pointerup</code></li>
      <li><code data-x="event-reset">reset</code></li>
      <li><code data-x="event-submit">submit</code></li>
+     <li><code data-x="event-touchend">touchend</code></li>
     </ul>
 
    </li>
@@ -119189,6 +119198,9 @@ INSERT INTERFACES HERE
    <dt id="refsPNG">[PNG]</dt>
    <dd><cite><a href="https://www.w3.org/TR/PNG/">Portable Network Graphics (PNG) Specification</a></cite>, D. Duce. W3C.</dd>
 
+   <dt id="refsPOINTEREVENTS">[POINTEREVENTS]</dt>
+   <dd><cite><a href="https://w3c.github.io/pointerevents/">Pointer Events</a></cite>, J. Rossi, M. Brubeck, R. Byers, P. H. Lauke. W3C.</dd>
+
    <dt id="refsPOINTERLOCK">[POINTERLOCK]</dt>
    <dd><cite><a href="https://w3c.github.io/pointerlock/">Pointer Lock</a></cite>, V. Scheib. W3C.</dd>
 
@@ -120009,6 +120021,7 @@ INSERT INTERFACES HERE
   Ms2ger,
   Nadia Heninger,
   NARUSE Yui,
+  Navid Zolghadr,
   Neil Deakin,
   Neil Rashbrook,
   Neil Soiffer,