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diff --git a/testing/web-platform/tests/css/CSS2/values/numbers-units-009.xht b/testing/web-platform/tests/css/CSS2/values/numbers-units-009.xht
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+++ b/testing/web-platform/tests/css/CSS2/values/numbers-units-009.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: Em size with the font-size set to px size</title>
+        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
+        <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#length-units" />
+        <link rel="help" href="https://www.w3.org/TR/css-values-3/#font-relative-lengths" />
+        <link rel="match" href="numbers-units-009-ref.xht"/>
+        <meta name="flags" content="ahem" />
+        <meta name="assert" content="The 'em' unit is equal to the computed value of the 'font-size' property (pixels) of the element on which it is used." />
+        <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+        <style type="text/css">
+            #div1
+            {
+                font-size: 32px;
+            }
+            #test
+            {
+                background: black;
+                height: 1em;
+                width: 1em;
+            }
+            div
+            {
+                font-family: Ahem;
+                margin-top: 10px;
+            }
+        </style>
+    </head>
+    <body>
+        <p>Test passes if the two boxes below are the same size.</p>
+        <div id="div1">
+            <div id="test"></div>
+            <div>X</div>
+        </div>
+    </body>
+</html>