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Test Info:

<!doctype html>
<link rel="match" href="table-cell-width-ref.html">
<style>
body {
margin: 0;
}
table {
width: 400px;
border-collapse: collapse;
}
th {
font-weight: normal;
text-align: left;
}
td, th {
padding: 0;
}
td:first-child, th:first-child {
background-color: red;
}
</style>
<!-- width=0 should be treated as 'auto' -->
<table>
<tr>
<th width=0>a</th>
<th>a</th>
</tr>
</table>
<table>
<tr>
<td width=0>a</td>
<td>a</td>
</tr>
</table>
<!-- test valid width attribute value-->
<table>
<tr>
<th width=100>a</th>
<th>a</th>
</tr>
</table>
<table>
<tr>
<td width=100>a</td>
<td>a</td>
</tr>
</table>