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<!DOCTYPE html>
<style>
table {
border-collapse: collapse;
}
td {
border: 5px solid black;
width: 100px;
height: 100px;
}
</style>
Passes if there is a grid containing 2x2 squares.
<table>
<tbody>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
</tbody>
</table>