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diff --git a/testing/web-platform/tests/css/CSS2/syntax/signed-numbers-001.xht b/testing/web-platform/tests/css/CSS2/syntax/signed-numbers-001.xht
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+++ b/testing/web-platform/tests/css/CSS2/syntax/signed-numbers-001.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 syntax: signed numbers</title>
+<link rel="author" title="Bert Bos" href="mailto:bert@w3.org" />
+<link rel="help" href="http://www.w3.org/TR/CSS22/syndata.html#numbers" />
+<link rel="help" href="http://www.w3.org/TR/CSS22/changes.html#s.4.3.1" />
+<link rel="match" href="signed-numbers-001-ref.xht" />
+<meta name="assert" content='Both integers and real numbers may immediately be preceded by a "-" or "+" to indicate the sign.' />
+<style type="text/css">
+  div {background: red; width: 20px; height: 100px}
+  .s1 {background: green; height: 20px}
+  .s2 {background: green; height: 10px; height: +20px}
+  .s3 {background: green; height: 20px; height: 1 0px}
+  .s4 {background: green; height: 20px; height: 1/*comment*/0px}
+  .s5 {background: green; height: 20px; height: + 10px}
+</style>
+</head>
+<body>
+  <p>This should show a tall green bar, and no red.</p>
+  <div>
+    <div class="s1"></div>
+    <div class="s2"></div>
+    <div class="s3"></div>
+    <div class="s4"></div>
+    <div class="s5"></div>
+  </div>
+</body>
+</html>