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<!DOCTYPE html>
<html>
<head>
<style>
table {
width: 300px;
height: 300px;
background-color: blue;
}
td, div {
margin: 0;
padding: 0;
}
#rel {
position: relative;
margin: 0;
padding: 0;
height: 1px;
}
#abs {
position: absolute;
margin: 0;
padding: 0;
top: 200.5px;
left: 25px;
width: 50px;
height: 50px;
background-color: green;
}
</style>
</head>
<body>
The green square should not touch the blue square.
<table>
<colgroup>
<col style="width: 15%">
<col>
</colgroup>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td>
<div id="rel">
<div id="abs"></div>
</div>
</td>
<td></td>
</tr>
</table>
</body>
</html>