table align center not working in github

1<table>
2  <tbody>
3    <tr>
4      <td align="center">Key Features<br>
5        <span>        </span>
6        <span>        </span>
7        <span>        </span>
8        <span>        </span>
9        <span>        </span>
10        <span>        </span>
11        <span>        </span>    
12        <span>  </span>
13      </td>
14      <td align="center">Examples<br>
15        <span>        </span>
16        <span>        </span>
17        <span>        </span>
18        <span>        </span>
19        <span>        </span>        
20        <span>        </span>
21        <span>        </span>
22        <span>  </span>
23      </td>
24      <td align="center">Supported Methods<br>
25        <span>        </span>
26        <span>        </span>
27        <span>        </span>
28        <span>        </span>    
29        <span>        </span>
30        <span>        </span>
31        <span>        </span>     
32        <span>  </span>        
33      </td>
34    </tr>
35  </tbody>
36</table>
37