Table tag is ignored in UI Widget

I tried to add table like this one

        		<table>
        			<tr>
        				<td><p>value1</p></td>
        				<td><p>value2</p></td>
        			</tr>
        			<tr>
        				<td><p>value3</p></td>
        				<td><p>value4</p></td>
        			</tr>
        		</table>

in the UI widget, but it’s not shown.