update mappings for button part of customizable select

html-aam/index.html

@@ -1270,7 +1270,7 @@ <h4 id="el-button-select-child">`button` as a child of a `select` element</h4>
             <tr>
               <th>[[wai-aria-1.2]]</th>
               <td>
-                <div class="general"><a href="#el-button-select-child-comments">See comments</a>.</div>
+                <div class="general">Not mapped. <a href="#el-button-select-child-comments">See comments</a>.</div>
                 <!-- a button that is a child of a select is not a typical "button" element.
                      it does not serve as a submit, reset, or generic 'button' type. Rather,
                      its purpose is directly tied to the rendering of a customized select
@@ -1282,57 +1282,57 @@ <h4 id="el-button-select-child">`button` as a child of a `select` element</h4>
             <tr>
               <th><a data-cite="core-aam-1.2/#roleMappingComputedRole">Computed Role</a></th>
               <td class="role-computed">
-                <div class="general"><a href="#el-button-select-child-comments">See comments</a>.</div>
+                <div class="general">Not mapped. <a href="#el-button-select-child-comments">See comments</a>.</div>
               </td>
             </tr>
             <tr>
               <th>
                 <a href="https://msdn.microsoft.com/en-us/library/dd373608%28v=VS.85%29.aspx">MSAA</a> + <a href="http://accessibility.linuxfoundation.org/a11yspecs/ia2/docs/html/">IAccessible2</a>
               </th>
               <td>
-sdfsddsaf
+                <div class="general"><a href="#el-button-select-child-comments">See comments</a></div>
               </td>
             </tr>
             <tr>
               <th><a href="https://msdn.microsoft.com/en-us/library/ms726297%28v=VS.85%29.aspx">UIA</a></th>
               <td>
-                <div class="general">Use WAI-ARIA mapping</div>
+                <div class="general"><a href="#el-button-select-child-comments">See comments</a></div>
               </td>
             </tr>
             <tr>
               <th><a href="https://gnome.pages.gitlab.gnome.org/atk/">ATK</a></th>
               <td>
-                <div class="general">Use WAI-ARIA mapping</div>
+                <div class="general"><a href="#el-button-select-child-comments">See comments</a></div>
               </td>
             </tr>
             <tr>
               <th><a href="https://developer.apple.com/reference/appkit/nsaccessibility">AX</a></th>
               <td>
-                <div class="general">Use WAI-ARIA mapping</div>
+                <div class="general"><a href="#el-button-select-child-comments">See comments</a></div>
               </td>
             </tr>
             <!-- <th><a href="#accessible-name-and-description-computation">Naming Algorithm</a></th> -->
             <tr>
               <th id="el-button-select-child-comments">Comments</th>
               <td>
-                <p>User agents MUST treat a `button` that is a child element of a `select` element as one item  in the accessibility tree.</p>
                 <p>
                   User agents MUST use the <a data-cite="accname-1.2/#mapping_additional_nd_te">text equivalent computation</a> of the subtree of the
                   `button` element as the exposed value of the `select` element. If the `button` contains no content, then there is no value to expose 
                   for the collapsed state of the `select`.
                 </p>
+                <p>
+                  Otherwise, user agents MUST treat the child `button` element of a `select` element as inert. The `select` and its child `button` are to be considered a single item
+                  in the user agent's accessibility tree.
+                </p>
                 <p class=note>
-                  TBD: indicate that global html/aria attributes and html/aria attributes specific to buttons are not to be respected on a button that is a child of a select?  Since the button/select are meant to be treated as one entity in the a11y tree, and the button's content is meant to be treated as the value for the select, and not the name of the select, it doesn't make much sense to treat this button as if it were actually a button... 
-            <br>
-            <br>
-            suggest ignoring accesskey, autofocus, contenteditable, draggable, inert, popover, tabindex, title
+                  As this `button` element is meant to be treated as inert, any use of global HTML or ARIA attributes, or attributes specific to the `button` element or ARIA's `button` role
+                  would not be exposed to the user agent's accessibility API.
                 </p>
                 <p>See also <a href="#el-select-combobox">`select`<span class="el-context"> (with NO `multiple` attribute and NO `size` attribute having value greater than `1`)</span></a></p>
               </td>
             </tr>
           </tbody>
-        </table>
-
+        </table>    
         <h4 id="el-canvas">`canvas`</h4>
         <table aria-labelledby="el-canvas">
           <tbody>