Add a user need and associated requirement for supporting system and …

…assistive technology conventions.

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@@ -174,5 +174,13 @@ <h2>Access Controls</h2>
       </ul>
       <p class="note"><cite>Web Content Accessibility Guidelines (WCAG) 2.2</cite> [[wcag22]] should be consulted for guidance on ensuring that the user interface for configuring access controls meets appropriate accessibility requirements.</p>
     </section>
+    <section>
+      <h2>General Guidance on Implementing Accessibility Features of Collaborative Environments</h2>
+      <p>To facilitate effective collaboration, applications should be designed to respect conventions of user interface design that are likely to be expected by users, including those who have disabilities.</p>
+      <ul>
+        <li><em>User Need 19:</em> Users with learning or cognitive disabilities or who use assistive technologies need to be able to learn collaboration tools efficiently, including software with which they are unfamiliar and which is necessary to the task at hand.</li>
+        <li><em>REQ 19:</em> Support the user interface conventions of the user's operating system, desktop environment, and assistive technology. For example, some assistive technologies, notably screen readers, provide commands and features for interacting with comments and revisions, which should be supported by collaboration tools to which these functions are applicable.</li>
+      </ul>
+    </section>
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