Add stub for abbr w/title mappings

Author: Rahim Abdi

html-aam/index.html

@@ -468,6 +468,57 @@ <h4 id="el-abbr">`abbr`</h4>
             </tr>
           </tbody>
         </table>
+
+        <h4 id="el-abbr-with-title">`abbr` (with non-empty `title` attribute)</h4>
+        <table class="data" aria-labelledby="el-abbr-with-title">
+          <tbody>
+            <tr>
+              <th>HTML Specification</th>
+              <td>
+                <a data-cite="HTML">`abbr`</a>
+              </td>
+            </tr>
+            <tr>
+              <th>[[wai-aria-1.2]]</th>
+              <td>No corresponding role</td>
+            </tr>
+            <tr>
+              <th><a data-cite="core-aam-1.2/#roleMappingComputedRole">Computed Role</a></th>
+              <td class="role-computed"><div class="general">`html-abbr`</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>
+                TBD.
+              </td>
+            </tr>
+            <tr>
+              <th><a href="https://msdn.microsoft.com/en-us/library/ms726297%28v=VS.85%29.aspx">UIA</a></th>
+              <td>
+                TBD.
+              </td>
+            </tr>
+            <tr>
+              <th><span class="informative">[[ATK]]</span></th>
+              <td>
+                TBD.
+              </td>
+            </tr>
+            <tr>
+              <th><a href="https://developer.apple.com/reference/appkit/nsaccessibility">AX</a></th>
+              <td>
+                TBD.
+              </td>
+            </tr>
+            <tr>
+              <th>Comments</th>
+              <td></td>
+            </tr>
+          </tbody>
+        </table>
+
         <h4 id="el-address">`address`</h4>
         <table class="data" aria-labelledby="el-address">
           <tbody>