Addition: allow aria-hidden on picture element

index.html

@@ -1205,7 +1205,7 @@ <h2 id="docconformance">
             </td>
             <td>
               <strong class="nosupport">No `role` or `aria-*` attributes</strong>
-              except `aria-hidden="true"`.
+              except <a data-cite="wai-aria-1.1#aria-hidden">`aria-hidden="true"`</a>.
             </td>
           </tr>
           <tr id="el-img-no-alt" tabindex="-1">
@@ -2070,7 +2070,13 @@ <h2 id="docconformance">
               <a>No corresponding role</a>
             </td>
             <td>
-              <strong class="nosupport">No `role` or `aria-*` attributes</strong>
+              <p><strong class="nosupport">no `role`</strong></p>
+              <div class="addition.proposed">
+              <p>
+                Authors MAY specify the <a data-cite="wai-aria-1.1#aria-hidden">`aria-hidden`</a> attribute on the `picture` element.
+                Otherwise, no other allowed `aria-*` attributes.
+              </p>
+              </div>
             </td>
           </tr>
           <tr id="el-pre" tabindex="-1">