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diff --git a/layout/reftests/pixel-rounding/collapsed-border-top-4.html b/layout/reftests/pixel-rounding/collapsed-border-top-4.html
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+++ b/layout/reftests/pixel-rounding/collapsed-border-top-4.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Pixel rounding testcase</title>
+<style type="text/css">
+
+html, body { margin: 0; border: none; padding: 0; }
+div { display: table; position: absolute; }
+
+</style>
+</head>
+<body>
+
+<!-- one border -->
+<div style="top: 10.4px; left: 10px; width: 10px; border-top: 10px solid green"></div>
+<div style="top: 10.4px; left: 30px; height: 10px; border-right: 10px solid green"></div>
+<div style="top: 10.4px; left: 50px; width: 10px; border-bottom: 10px solid green"></div>
+<div style="top: 10.4px; left: 70px; height: 10px; border-left: 10px solid green"></div>
+
+<!-- two adjacent borders -->
+<div style="top: 10.4px; left: 90px; border-top: 10px solid green; border-right: 10px solid green"></div>
+<div style="top: 10.4px; left: 110px; border-bottom: 10px solid green; border-right: 10px solid green"></div>
+<div style="top: 10.4px; left: 130px; border-top: 10px solid green; border-left: 10px solid green"></div>
+<div style="top: 10.4px; left: 150px; border-bottom: 10px solid green; border-left: 10px solid green"></div>
+
+<!-- two opposite borders -->
+<div style="top: 10.4px; left: 170px; width: 10px; border-top: 5px solid green; border-bottom: 5px solid green;"></div>
+<div style="top: 10.4px; left: 190px; width: 10px; border-top: 5px solid green; border-bottom: 5px solid green;"></div>
+<div style="top: 10.4px; left: 210px; height: 10px; border-right: 5px solid green; border-left: 5px solid green"></div>
+
+<!-- three borders -->
+<div style="top: 10.4px; left: 230px; border-right: 5px solid green; border-bottom: 10px solid green; border-left: 5px solid green"></div>
+<div style="top: 10.4px; left: 250px; border-right: 5px solid green; border-top: 10px solid green; border-left: 5px solid green"></div>
+<div style="top: 10.4px; left: 270px; border-top: 5px solid green; border-bottom: 5px solid green; border-left: 10px solid green"></div>
+<div style="top: 10.4px; left: 290px; border-top: 5px solid green; border-bottom: 5px solid green; border-left: 10px solid green"></div>
+<div style="top: 10.4px; left: 310px; border-top: 5px solid green; border-bottom: 5px solid green; border-right: 10px solid green"></div>
+<div style="top: 10.4px; left: 330px; border-top: 5px solid green; border-bottom: 5px solid green; border-right: 10px solid green"></div>
+
+<!-- four borders -->
+<div style="top: 10.4px; left: 350px; border-top: 5px solid green; border-right: 5px solid green; border-bottom: 5px solid green; border-left: 5px solid green"></div>
+<div style="top: 10.4px; left: 370px; border-top: 5px solid green; border-right: 5px solid green; border-bottom: 5px solid green; border-left: 5px solid green"></div>
+
+<!-- border around space -->
+<div style="top: 30.4px; left: 10px; border: 10px solid green; height: 20px; width: 20px"></div>
+
+</body>
+</html>