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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fraction default padding</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
+    <meta name="assert" content="Verifies 1px padding is added around each side of the fraction.">
+    <link rel="match" href="frac-default-padding-ref.html">
+    <style type="text/css">
+      @font-face {
+        font-family: TestFont;
+        src: url("/fonts/math/fraction-rulethickness10000.woff");
+      }
+      math {
+        /* FractionRuleThickness = 10000 * 1 / 1000 = 10px; */
+        /* The gap / shift / axisheight parameters are set to 0. */
+        font-family: "TestFont";
+        font-size: 1px;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if you see three green squares of same size, separated by a gap of one pixel.</p>
+    <div>
+      <math>
+        <mspace width="150px" height="75px" depth="75px" style="background: green"/>
+        <mfrac style="color: green; font-size: 15em">
+          <mspace id="numerator" width="150px"></mspace>
+          <mspace></mspace>
+        </mfrac>
+        <mspace width="150px" height="75px" depth="75px" style="background: green"/>
+      </math>
+    </div>
+    <script src="/mathml/support/feature-detection.js"></script>
+    <script>MathMLFeatureDetection.ensure_for_match_reftest("has_mfrac");</script>
+  </body>
+</html>