Correct ATK mapping for input type="color"

  * If implemented as a textbox, it should be mapped as a textbox
  * If implemented as a button, it should be mapped as a button

See github issue w3c#139.

index.html

@@ -1553,8 +1553,12 @@ <h3>HTML Element Role Mappings</h3>
                   <!-- <div class="ctrlpattern"><span class="type">Control Pattern: </span><code>Selection</code> for the container and <code>SelectionItem</code> for each color choice</div> -->
                 </td>
                 <td class="atk">
-                  <div class="general">Implemented as a color picker:</div>
-                  <div class="role"><span class="type">Role: </span><code>ATK_ROLE_COLOR_CHOOSER</code></div>
+                  <div class="general">
+                    If implemented as a button, use WAI-ARIA mapping for <a class="core-mapping" href="#role-map-button"><code>button</code></a>.
+                  </div>
+                  <div class="general">
+                    If implemented as a textbox, use WAI-ARIA mapping for <a class="core-mapping" href="#role-map-textbox"><code>textbox</code></a>.
+                  </div>
                 </td>
                 <td class="ax">
                     <div class="general">If implemented as a textbox:</div>