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<!DOCTYPE html>
<html style="height: 100%">
<body style="height: 100%">
<table style="height: 50%; width: 50%">
<tr>
<td id="x" style="position: relative; top: 25%; left: 25%">
<div style="position: absolute; left: 0; right: 0; top: 0; bottom: 0;
background: green"></div>
</td>
</tr>
</table>
</body>
</html>