How can I create a diagonal line from the lower left corner to the upper right corner of any given cell?

To get this

<table>
    <tr>
        <td class="crossOut">A1</td>
        <td>B1</td>
    </tr>
    <tr>
        <td>A2 Wide</td>
        <td class="crossOut">B2<br/>Very<br/>Tall</td>
    </tr>
</table>

to show this

enter image description here

jquery html css
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