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diff --git a/testing/web-platform/tests/css/css-fonts/math-script-level-and-math-style/math-script-level-003.tentative.html b/testing/web-platform/tests/css/css-fonts/math-script-level-and-math-style/math-script-level-003.tentative.html
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+++ b/testing/web-platform/tests/css/css-fonts/math-script-level-and-math-style/math-script-level-003.tentative.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>math-depth</title>
+    <meta charset="utf-8">
+    <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3746">
+    <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#the-math-script-level-property">
+    <meta name="assert" content="If specified font-size is not 'math' then math-depth does not affect the computed value of font-size.">
+    <link rel="match" href="math-script-level-003.tentative-ref.html">
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+      .container {
+          /* Ahem font does not have a MATH table so the font-size scale factor
+             is always 0.71^{computed - inherited math script level} */
+          font: 100px/1 Ahem;
+      }
+    </style>
+  </head>
+  <body>
+    <p>Test passes if you see two squares of side 100px.</p>
+    <div class="container">
+      <!-- font-size: <length> -->
+      <div style="math-depth: 1; font-size: 100px;">X</div>
+    </div>
+    <br/>
+    <div class="container">
+      <!-- inherited font-size -->
+      <div style="math-depth: 1;">X</div>
+    </div>
+  </body>
+</html>