add the new search element

keeping this straight forward for the new element's initial inclusion.

being that this is a new element, the reasoning for authors to need to immediately apply overwriting roles is irrelevant.  Thus I see no reason to initially allow any roles on this element.

All global `aria-*` attributes would be allowed on this element.

index.html

@@ -2391,6 +2391,27 @@ <h2 id="docconformance">
               </p>
             </td>
           </tr>
+          <tr>
+            <th id="el-search" tabindex="-1">
+              [^search^]
+            </th>
+            <td>
+              <p>
+                <code>role=<a href="#index-aria-search">search</a></code>
+              </p>
+            </td>
+            <td>
+              <div class="addition proposed">
+                <p>
+                  <a><strong class="nosupport">No `role`</strong></a>
+                </p>
+                <p>
+                  <a data-cite="wai-aria-1.1#global_states">Global `aria-*` attributes</a> 
+                  and any `aria-*` attributes applicable to the allowed roles.
+                </p>
+              </div>
+            </td>
+          </tr>
           <tr>
             <th id="el-section" tabindex="-1">
               [^section^]