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<!DOCTYPE HTML>
<html>
<head>
<title>basis of percentage widths</title>
<style type="text/css">
td { border-width: 0; }
td div { border: 3px inset blue; padding: 3px; }
</style>
</head>
<body>
<!--
The difference between the border-box width of the table and the width allocated to the columns is:
2px = table border-left-width
9px = table padding-left
25px = 5 * table border-spacing-x
5px = table padding-right
2px = table border-left-width
=================================
43px
-->
<table cellpadding="0" cellspacing="5" border="2" style="padding: 3px 5px 7px 9px">
<tr>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 38px">x</div></td>
</tr>
</table>
<table cellpadding="0" cellspacing="5" border="2" style="padding: 3px 5px 7px 9px">
<tr>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 38px">x</div></td>
</tr>
</table>
<table cellpadding="0" cellspacing="5" border="2" style="padding: 3px 5px 7px 9px">
<tr>
<td><div style="width: 88px">x</div></td>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 113px">x</div></td>
<td><div style="width: 113px">x</div></td>
</tr>
</table>
<table cellpadding="0" cellspacing="5" border="2" style="padding: 3px 5px 7px 9px">
<tr>
<td><div style="width: 33px">x</div></td>
<td><div style="width: 23px">x</div></td>
<td><div style="width: 38px">x</div></td>
<td><div style="width: 38px">x</div></td>
</tr>
</table>
</body>
</html>