Addition: inert attribute mappings (#410)

Author: scottaohara

index.html

@@ -4279,6 +4279,27 @@ <h3>HTML Attribute State and Property Mappings</h3>
               <td class="ax"><div class="general">Not mapped</div></td>
               <td class="comments"></td>
             </tr>
+            <tr tabindex="-1" id="att-inert">
+              <th>`inert`</th>
+              <td class="elements">
+                <a data-cite="html/interaction.html#the-inert-attribute">HTML elements</a>
+              </td>
+              <td class="aria">Not Mapped</td>
+              <td class="ia2">See comments</td>
+              <td class="uia">See comments</td>
+              <td class="atk">See comments</td>
+              <td class="ax">See comments</td>
+              <td class="comments">
+                <p>
+                  Nodes that are <a data-cite="html/interaction.html#inert">inert</a> are not exposed to an accessibility API.
+                </p>
+                <p class="note">
+                  Note: an inert node can have descendants that are not inert. For example, a
+                  <a data-cite="html/interaction.html#modal-dialogs-and-inert-subtrees">modal dialog</a>
+                  can escape an inert subtree.
+                </p>
+              </td>
+            </tr>
             <tr tabindex="-1" id="att-indeterminate">
               <th>`indeterminate [IDL]`</th>
               <td class="elements">
@@ -6177,6 +6198,7 @@ <h3>Change Log</h3>
       <section>
         <h4>Substantive changes since moving to the <a href="https://www.w3.org/WAI/ARIA/">Accessible Rich Internet Applications Working Group</a> (03-Nov-2019)</h4>
         <ul>
+          <li>28-Mar-2023: Add `inert` attribute mapping. See <a href="https://github.com/w3c/html-aam/pull/410">GitHub PR 410</a>.</li>
           <li>24-Mar-2023: Add `search` element and its mappings. See <a href="https://github.com/w3c/html-aam/pull/355/">GitHub PR 355</a>.</li>
           <li>08-Mar-2023: Update `hgroup` element to be mapped to `role=group`. See  <a href="https://github.com/w3c/html-aam/pull/398">GitHub PR 398</a>.</li>
           <li>08-Mar-2023: Clarify naming algorithm for `output` element. See <a href="https://github.com/w3c/html-aam/pull/402">GitHub PR 402</a>.</li>