st passes if there is no red visible on the page.</p>
        <table>
            <tr>
                <td>hidden</td>
                <td id="cell1">hidden</td>
                <td>hidden</td>
            </tr>
            <tr>
                <td id="cell2">hidden</td>
                <td id="cell3">hidden</td>
                <td id="cell4">hidden</td>
            </tr>
            <tr>
                <td>hidden</td>
                <td id="cell5">hidden</td>
                <td>hidden</t