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+++ b/testing/web-platform/tests/mathml/presentation-markup/operators/mo-not-in-dictionary-lspace-rspace-ref.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>lspace/rspace default value for unknown operators (reference)</title>
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+      math {
+          font: 100px/1 Ahem;
+      }
+      mo {
+          color: blue;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if on each row, the space around the blue rectangle
+      is 0.2777777777777778em.</p>
+    <p>
+      <math>
+        <mrow>
+          <mn>p</mn>
+          <mo lspace="0.2777777777777778em" rspace="0.2777777777777778em">X</mo> <!-- Single character -->
+          <mn>p</mn>
+        </mrow>
+      </math>
+    </p>
+    <p>
+      <math>
+        <mrow>
+          <mn>p</mn>
+          <mo lspace="0.2777777777777778em" rspace="0.2777777777777778em">XX</mo> <!-- Multiple characters -->
+          <mn>p</mn>
+        </mrow>
+      </math>
+    </p>
+    <p>
+      <math>
+        <mrow>
+          <mn>p</mn>
+          <mo form="infix" lspace="0.2777777777777778em" rspace="0.2777777777777778em">X</mo> <!-- Explicit form -->
+          <mn>p</mn>
+        </mrow>
+      </math>
+    </p>
+  </body>
+</html>