This is for Dennis, because he couldn’t find it on the internet:
Mouse over the 1 to change its cell colour.
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HTML
<table border="1">
<tr>
<td>0</td>
<td>
<table border="1">
<tr>
<td>0</td>
<td>
<table border="1">
<tr>
<td>1</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td>0</td>
</tr>
</table>
So basically just three tables nested.
CSS
td td td:hover { background-color: #aeaeae; }
td td td:hover
means that when the mouse is over a td tag, that is a descendant (within) of a td tag that is a descendant of a td tag this style is active.