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diff --git a/layout/reftests/floats/478834-1.html b/layout/reftests/floats/478834-1.html
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+++ b/layout/reftests/floats/478834-1.html
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+<!DOCTYPE html>
+<html>
+<head>
+  <title>Bug 478834 Testcase</title>
+  <style>
+  html { overflow: hidden }
+  </style>
+</head>
+<body>
+<div style="background:teal; width: 500px">
+  <div style="background:yellow; float:left; width: 100px; height: 50px;"></div>
+  <div style="margin-right: 150px">
+    <table width="100%" style="background: fuchsia">
+      <tr><td>
+        x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x x x x x x x x x x x x x x x x x x
+      </td></tr>
+    </table>
+  </div>
+</div>
+</body>
+</html>