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diff --git a/testing/web-platform/tests/css/CSS2/margin-padding-clear/margin-top-109.xht b/testing/web-platform/tests/css/CSS2/margin-padding-clear/margin-top-109.xht
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+++ b/testing/web-platform/tests/css/CSS2/margin-padding-clear/margin-top-109.xht
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+    <head>
+        <title>CSS Test: Margin-top sets a negative zero value with no units, -0</title>
+        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
+		<link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-08-20 -->
+        <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#propdef-margin-top" />
+        <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#margin-properties" />
+		<link rel="match" href="../reference/ref-no-vert-space-between.xht" />
+
+        <meta name="assert" content="The 'margin-top' property sets a negative zero length value with no units." />
+        <style type="text/css">
+            #div1
+            {
+                border-top: 5px solid blue;
+            }
+            #div2
+            {
+                border-top: 5px solid orange;
+                margin-top: -0;
+            }
+        </style>
+    </head>
+    <body>
+        <p>Test passes if there is <strong>no space between</strong> the blue and orange lines.</p>
+        <div id="div1"></div>
+        <div id="div2"></div>
+    </body>
+</html>
+\ No newline at end of file