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diff --git a/testing/web-platform/tests/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html b/testing/web-platform/tests/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html
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+++ b/testing/web-platform/tests/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions linethickness</title>
+    <style type="text/css">
+      @font-face {
+        font-family: TestFont;
+        src: url("/fonts/math/fraction-rulethickness10000.woff");
+      }
+      math {
+        /* FractionRuleThickness = 10000 * 1 / 1000 = 10px; */
+        font-family: "TestFont";
+        font-size: 1px;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if you see the same fraction four times.</p>
+    <math>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>