Restored Delete to Example of Tabs With Automatic Activation

Per discussion in issue #278, modified examples/tabs/tabs-1/tabs.html:
1. Added description of the delete feature in the accessibility features section.
2. Added Delete to the keyboard table.
3. To be consistent with editorial guidelines, gave key names initial caps in the keyboard table.

examples/tabs/tabs-1/tabs.html

@@ -60,15 +60,12 @@ <h2 id="ex_label">Example</h2>
         <div role="separator" id="ex_end_sep" aria-labelledby="ex_end_sep ex_label" aria-label="End of"></div>
       </section>
 
-      <section hidden>
+      <section>
         <h2>Accessibility Features</h2>
-        <p class="annotate">Please replace this content with a list of accessibility features demonstrated in this implementation, such as:</p>
-        <ul>
-          <li>ARIA roles</li>
-          <li>property and state information</li>
-          <li>Event handlers</li>
-          <li><code>tabindex</code> values</li>
-        </ul>
+        <p>
+          To demonstrate the effects of deleting a tab, the third tab, labeled <q>Joke</q>, 
+          can be deleted when it has focus by pressing <kbd>Delete</kbd>.
+        </p>
       </section>
 
       <section>
@@ -82,7 +79,7 @@ <h2 id="kbd_label">Keyboard Support</h2>
           </thead>
           <tbody>
             <tr>
-              <th><kbd>tab</kbd></th>
+              <th><kbd>Tab</kbd></th>
               <td>
                 <ul>
                   <li>When focus moves into the tab list, places focus on the active <code>tab</code> element .</li>
@@ -91,7 +88,7 @@ <h2 id="kbd_label">Keyboard Support</h2>
               </td>
             </tr>
             <tr>
-              <th><kbd>right arrow</kbd></th>
+              <th><kbd>Right Arrow</kbd></th>
               <td>
                 <ul>
                   <li>Moves focus to the next tab.</li>
@@ -101,7 +98,7 @@ <h2 id="kbd_label">Keyboard Support</h2>
               </td>
             </tr>
             <tr>
-              <th><kbd>left arrow</kbd></th>
+              <th><kbd>Left Arrow</kbd></th>
               <td>
                 <ul>
                   <li>Moves focus to the previous tab.</li>
@@ -111,13 +108,17 @@ <h2 id="kbd_label">Keyboard Support</h2>
               </td>
             </tr>
             <tr>
-              <th><kbd>home</kbd></th>
+              <th><kbd>Home</kbd></th>
               <td>Moves focus to the first tab and activates it.</td>
             </tr>
             <tr>
-              <th><kbd>end</kbd></th>
+              <th><kbd>End</kbd></th>
               <td>Moves focus to the last tab and activates it.</td>
             </tr>
+            <tr>
+              <th><kbd>Delete</kbd></th>
+              <td>When focus is on the <q>Joke</q> tab,removes the tab from the tab list and places focus on the previous tab.</td>
+            </tr>
           </tbody>
         </table>
       </section>