revise wording of comment section content

html-aam/index.html

@@ -6392,10 +6392,14 @@ <h4 id="el-selectedcontent">`selectedcontent`</h4>
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               <th>Comments</th>
               <td>
-                <p>The `selectedcontent` element is meant to be declared as a child of the `button` part of a custom styled `select` element.
-                As the `button` part is meant to be treated as inert, the `selectedcontent` element will commonly be treated as inert, as well.</p>
+                <p>The `selectedcontent` element is a declarable child of the `button` part of a custom styled `select` element.
+                The `button` part of the `select` element's anatomy, and thus the `selectedcontent` element descendant, are inert.</p>
+                <p>
+                  The <a data-cite="accname-1.2/#mapping_additional_nd_te">text equivalent computation</a> of the subtree of the `selectedcontent`
+                  element participates in the calculation of the `select` element's accessible value. 
+                </p>
                 <p class=note>
-                  As the parent `button` element to the `selectedcontent` element is meant to be treated as inert, any use of global HTML or ARIA attributes, or attributes specific to the `selectedcontent` element would not be exposed to the user agent's accessibility API.
+                  As part of the anatomy of a customized `select` element, the ancestor `button` element to the `selectedcontent` element is inert, any use of global HTML or ARIA attributes, or attributes specific to the `selectedcontent` element are not to be exposed to the user agent's accessibility API.
                 </p>
               </td>
             </tr>