* <p> paragraph with a <br>singletonElement. <hr> And it contains another one. </p>
* <li> List with singletonElement
* <param name=movie value="~/imitation game.mp4"> <param name=allowfullscreen value=true> </li>
*
* <tr> tr with <base href="www.something.com"> singletonElement </tr>
* <td> td with singletonElement <br/> </td>
* <th> th with <base/> singletonElement </th>
* <body> body with <br/> singletonElement </body>
* <colgroup><col><col><col></colgroup>
* <dd> dd with <hr> singletonElement </dd>
* <dt> dt with <img src="~/singletonElement.jpg" alt="" width="100" height="150"/> singletonEl </dt>
* <head> head with <img src="~/singletonElement.jpg" alt="" width="100" height="150">
* singletonElement </head>
*
* <html> <bR> <Br> <BR> <Br/> <BR/> <bR/> </html>
* <option> <INPut/> </option>
* <tbody> <input/> <br> </tbody>
* <thead> <br> </thead>
* <tfoot> <AREA ALT="alt" COORDS="100,0,200,50" HREF="/href/"> </tfoot>