html code not work <h1>This is a Heading</h1> <p>This is a paragraph.</p> <ul> <li>Coffee</li> <li>Tea</li> <li>Milk</li> </ul> HTML Table <table> <tr> <th>Firstname</th> <th>Lastname</th> <th>Age</th> </tr> <tr> <td>Jill</td> <td>Smith</td> <td>50</td> </tr> <tr> <td>Eve</td> <td>Jackson</td> <td>94</td> </tr> </table>