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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<style>
table {
border-collapse: collapse;
background-color: red;
}
td, th {
background-color: lime;
width:100px;
height:100px;
box-sizing:border-box;
}
td {
border-top: 4px solid lime;
}
</style>
</head>
<body>
<table cellpadding="0">
<tr><th colspan="2"></th></tr>
<tr><th></th><td></td>
</table>
</body>
</html>