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diff --git a/layout/reftests/pixel-rounding/rounded-background-color-width-left-4.html b/layout/reftests/pixel-rounding/rounded-background-color-width-left-4.html
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index 000000000..7cba93c2b
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+++ b/layout/reftests/pixel-rounding/rounded-background-color-width-left-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; }
+
+body > div { margin: 10px; height: 80px; position: relative; }
+
+body > div > div {
+    position: absolute; top: 0; left: -0.1px; height: 10px; width: 10.5px;
+}
+
+body > div > div { background: green; }
+
+.tl { top: 20px; }
+.tr { margin-top: 40px; }
+.bl { left: 19.9px; }
+.br { margin-left: 40px; }
+
+div.one > div.tl { border-top-left-radius: 1px; }
+div.one > div.tr { border-top-right-radius: 1px; }
+div.one > div.bl { border-bottom-left-radius: 1px; }
+div.one > div.br { border-bottom-right-radius: 1px; }
+div.four > div.tl { border-top-left-radius: 4px; }
+div.four > div.tr { border-top-right-radius: 4px; }
+div.four > div.bl { border-bottom-left-radius: 4px; }
+div.four > div.br { border-bottom-right-radius: 4px; }
+
+</style>
+</head>
+<body>
+
+<div class="one">
+<div></div>
+<div class="tl"></div>
+<div class="tr"></div>
+<div class="bl"></div>
+<div class="br"></div>
+<div class="tl tr"></div>
+<div class="tl bl"></div>
+<div class="tl br"></div>
+<div class="tr bl"></div>
+<div class="tr br"></div>
+<div class="bl br"></div>
+<div class="tl tr bl"></div>
+<div class="tl tr br"></div>
+<div class="tl bl br"></div>
+<div class="tr bl br"></div>
+<div class="tl tr bl br"></div>
+</div>
+
+<div class="four">
+<div></div>
+<div class="tl"></div>
+<div class="tr"></div>
+<div class="bl"></div>
+<div class="br"></div>
+<div class="tl tr"></div>
+<div class="tl bl"></div>
+<div class="tl br"></div>
+<div class="tr bl"></div>
+<div class="tr br"></div>
+<div class="bl br"></div>
+<div class="tl tr bl"></div>
+<div class="tl tr br"></div>
+<div class="tl bl br"></div>
+<div class="tr bl br"></div>
+<div class="tl tr bl br"></div>
+</div>
+
+</body>
+</html>