Add manual test for data-sort.

public/index.html

@@ -18,6 +18,7 @@ <h1>Manual testing of table sort js</h1>
           <th>Runtime</th>
           <th class="onload-sort">File Size</th>
           <th>dates in dd/mm/yyyy</th>
+          <th class="data-sort">data-sort days</th>
         </tr>
       </thead>
       <tr class="table-row-1">
@@ -29,6 +30,7 @@ <h1>Manual testing of table sort js</h1>
         <td>1h 1m 17s</td>
         <td>10b</td>
         <td>17/6/1978</td>
+        <td data-sort="2">Tuesday</td>
       </tr>
       <tr class="table-row-2">
         <td>da Vinci</td>
@@ -39,6 +41,7 @@ <h1>Manual testing of table sort js</h1>
         <td>1m 45s</td>
         <td>192038998987021b</td>
         <td>18/10/2027</td>
+        <td data-sort="3">Wednesday</td>
       </tr>
       <tr>
         <td>Statham</td>
@@ -49,6 +52,7 @@ <h1>Manual testing of table sort js</h1>
         <td>11m 40s</td>
         <td>134809b</td>
         <td>4/9/2008</td>
+        <td data-sort="5">Friday</td>
       </tr>
       <tr>
         <td>Micheal</td>
@@ -59,6 +63,7 @@ <h1>Manual testing of table sort js</h1>
         <td>29s</td>
         <td>30980980b</td>
         <td>2/3/1879</td>
+        <td data-sort="4">Thursday</td>
       </tr>
 
       <tr>
@@ -70,6 +75,7 @@ <h1>Manual testing of table sort js</h1>
         <td>41s</td>
         <td>902938402398b</td>
         <td>8/6/1978</td>
+        <td data-sort="1">Monday</td>
       </tr>
     </table>
   </body>