Add more YAML specific features

Author: anatoly-scherbakov

spec/index.html

@@ -626,6 +626,18 @@ <h3>JSON vs YAML comparison</h3>
           <td>1</td>
           <td>⩾ 1 via <a>YAML stream</a></td>
         </tr>
+
+        <tr>
+          <th>Comments</th>
+          <td>❌</td>
+          <td><a data-cite="YAML#3233-comments">✔️</a></td>
+        </tr>
+
+        <tr>
+          <th>Anchors & aliases</th>
+          <td>❌</td>
+          <td><a data-cite="YAML#3222-anchors-and-aliases">✔️</a></td>
+        </tr>
         </tbody>
       </table>
     </section>