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<!DOCTYPE html>
<link rel="author" title="David Shin" href="dshin@mozilla.com">
<style>
table {
border-collapse: collapse;
}
.group {
border-top: 1px solid black;
border-bottom: 3px solid black;
}
</style>
<table>
<tr id="row"><td class="group">X</td><td>X</td><td>X</td><td class="group">X</td></tr>
</table>