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diff --git a/layout/reftests/table-background/border-separate-opacity-table-column-group.html b/layout/reftests/table-background/border-separate-opacity-table-column-group.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+<html lang="en-US">
+<head>
+	<title>Table background tests</title>
+	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+	<meta http-equiv="Content-Style-Type" content="text/css">
+	<style type="text/css">
+
+	html, body { margin: 0; padding: 0; border: 0; font-size: 16px; }
+	body { padding: 15px; }
+
+	.o { opacity: 0.5; }
+
+	table { 
+		margin: 0 3px 2px 4px; /* zero top to work around collapsing bug */
+		border: transparent solid;
+		border-width: 4px 2px 7px 3px;
+		padding: 3px 7px 8px 6px;
+		border-collapse: separate;
+		border-spacing: 2px 3px;
+	}
+
+	td {
+		border: transparent solid;
+		border-width: 2px 1px 4px 3px;
+		padding: 1px 2px 4px 3px;
+		empty-cells: show;
+	}
+
+	div { height: 10px; width: 50px; }
+
+	table.color colgroup.t { background-color: aqua; }
+
+	table.imagetl colgroup.t, table.imagebr colgroup.t {
+		background-image: url(repeatable-diagonal-gradient-with-ticks.png);
+	}
+
+	table.imagetl colgroup.t { background-position: top left; /* default */ }
+	table.imagebr colgroup.t { background-position: bottom right; /* default */ }
+
+	</style>
+</head>
+<body>
+
+<table class="color">
+	<colgroup><col></colgroup>
+	<colgroup class="t">
+        <col>
+        <col class="t o">
+        <col>
+	</colgroup>
+	<colgroup><col></colgroup>
+	<tbody>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+	<tbody class="t o">
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+        <tr class="t o"><td><div></div></td><td><div></div></td><td class="t o"><div></div></td><td><div></div></td><td><div></div></td></tr>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+	<tbody>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+</table>
+
+<table class="imagetl">
+	<colgroup><col></colgroup>
+	<colgroup class="t o">
+        <col>
+        <col class="t">
+        <col>
+	</colgroup>
+	<colgroup><col></colgroup>
+	<tbody>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+	<tbody class="t">
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+        <tr class="t"><td><div></div></td><td><div></div></td><td class="t"><div></div></td><td><div></div></td><td><div></div></td></tr>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+	<tbody>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+</table>
+
+<table class="imagebr">
+	<colgroup><col></colgroup>
+	<colgroup class="t o">
+        <col>
+        <col class="t">
+        <col>
+	</colgroup>
+	<colgroup><col></colgroup>
+	<tbody>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+	<tbody class="t">
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+        <tr class="t"><td><div></div></td><td><div></div></td><td class="t"><div></div></td><td><div></div></td><td><div></div></td></tr>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+	<tbody>
+        <tr><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td><td><div></div></td></tr>
+	</tbody>
+</table>
+
+</body>
+</html>