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+++ b/testing/web-platform/tests/mathml/presentation-markup/scripts/subsup-legacy-scriptshift-attributes-001.tentative.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>msub/msup/msubsup/mmultiscripts subscriptshift and superscriptshift attributes</title>
+    <link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.msub">
+    <link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.msup">
+    <link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.msunsup">
+    <link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.mmultiscripts">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#prescripts-and-tensor-indices-mmultiscripts">
+    <link rel="match" href="subsup-legacy-scriptshift-attributes-001.tentative-ref.html">
+  </head>
+  <body>
+    <p>Test passes if the green squares are not about 300px away from the blue squares.</p>
+    <p>
+      <math>
+        <mmultiscripts subscriptshift="300px" superscriptshift="300px">
+          <mspace width="30px" height="30px" style="background: blue;"></mspace>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+          <mprescripts/>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+        </mmultiscripts>
+        <msub subscriptshift="300px">
+          <mspace width="30px" height="30px" style="background: blue;"></mspace>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+        </msub>
+        <msup superscriptshift="300px">
+          <mspace width="30px" height="30px" style="background: blue;"></mspace>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+        </msup>
+        <msubsup subscriptshift="300px" superscriptshift="300px">
+          <mspace width="30px" height="30px" style="background: blue;"></mspace>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+          <mspace width="10px" height="10px" style="background: lightgreen;"></mspace>
+        </msubsup>
+      </math>
+    </p>
+    <script src="/mathml/support/feature-detection.js"></script>
+    <script>
+      MathMLFeatureDetection.ensure_for_match_reftest("has_mspace");
+      MathMLFeatureDetection.ensure_for_match_reftest("has_msubsup");
+      MathMLFeatureDetection.ensure_for_match_reftest("has_mmultiscripts");
+    </script>
+  </body>
+</html>