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diff --git a/layout/reftests/pixel-rounding/background-image-width-left-4.html b/layout/reftests/pixel-rounding/background-image-width-left-4.html
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+++ b/layout/reftests/pixel-rounding/background-image-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; }
+div { position: absolute; height: 10px; width: 10.5px; }
+
+div.i1  { top: 10px; background-image: url(blue-1x1.png); }
+div.i3  { top: 30px; background-image: url(blue-3x3.png); }
+div.i5  { top: 50px; background-image: url(blue-5x5.png); }
+div.i25 { top: 70px; background-image: url(blue-25x25.png); }
+
+div.p1 { left: 9.9px; background-position: top left; }
+div.p2 { left: 29.9px; background-position: top; }
+div.p3 { left: 49.9px; background-position: top right; }
+div.p4 { left: 69.9px; background-position: left; }
+div.p5 { left: 89.9px; background-position: center; }
+div.p6 { left: 109.9px; background-position: right; }
+div.p7 { left: 129.9px; background-position: bottom left; }
+div.p8 { left: 149.9px; background-position: bottom; }
+div.p9 { left: 169.9px; background-position: bottom right; }
+
+</style>
+</head>
+<body>
+
+<div class="i1 p1"></div>
+<div class="i1 p2"></div>
+<div class="i1 p3"></div>
+<div class="i1 p4"></div>
+<div class="i1 p5"></div>
+<div class="i1 p6"></div>
+<div class="i1 p7"></div>
+<div class="i1 p8"></div>
+<div class="i1 p9"></div>
+
+<div class="i3 p1"></div>
+<div class="i3 p2"></div>
+<div class="i3 p3"></div>
+<div class="i3 p4"></div>
+<div class="i3 p5"></div>
+<div class="i3 p6"></div>
+<div class="i3 p7"></div>
+<div class="i3 p8"></div>
+<div class="i3 p9"></div>
+
+<div class="i5 p1"></div>
+<div class="i5 p2"></div>
+<div class="i5 p3"></div>
+<div class="i5 p4"></div>
+<div class="i5 p5"></div>
+<div class="i5 p6"></div>
+<div class="i5 p7"></div>
+<div class="i5 p8"></div>
+<div class="i5 p9"></div>
+
+<div class="i25 p1"></div>
+<div class="i25 p2"></div>
+<div class="i25 p3"></div>
+<div class="i25 p4"></div>
+<div class="i25 p5"></div>
+<div class="i25 p6"></div>
+<div class="i25 p7"></div>
+<div class="i25 p8"></div>
+<div class="i25 p9"></div>
+
+</body>
+</html>