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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>Horizontal stretchy operator (reference)</title>
+<style>
+  @font-face {
+    font-family: TestFont;
+    src: url("/fonts/math/stretchy.woff");
+  }
+  math, mo {
+    font-family: TestFont;
+    font-size: 50px;
+  }
+</style>
+<body>
+  <p>This test passes if you see green rectangles and no red.</p>
+
+  <div style="position: absolute; left: 3em; top; 3em;
+              width: 1000px; height: 500px; background: lightgreen;">
+
+    <div style="position: absolute; top: 1px; left: 1px;">
+      <!-- stretchy base in munder -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munder>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+            <mspace width="200px" height="0px"/>
+          </munder>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 1px; left: 251px;">
+      <!-- stretchy script in munder -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munder>
+            <mspace width="200px" height="0px"/>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+          </munder>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 101px; left: 1px;">
+      <!-- stretchy base in mover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <mover>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+            <mspace width="200px" height="0px"/>
+          </mover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 101px; left: 251px;">
+      <!-- stretchy script in mover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <mover>
+            <mspace width="200px" height="0px"/>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+          </mover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 201px; left: 1px;">
+      <!-- stretchy base in munderover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munderover>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+            <mspace width="200px" height="0px"/>
+            <mspace width="200px" height="0px"/>
+          </munderover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 201px; left: 251px;">
+      <!-- stretchy underscript in munderover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munderover>
+            <mspace width="200px" height="0px"/>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+            <mspace width="200px" height="0px"/>
+          </munderover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 301px; left: 1px;">
+      <!-- stretchy overscript in munderover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munderover>
+            <mspace width="200px" height="0px"/>
+            <mspace width="200px" height="0px"/>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+          </munderover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 1px; left: 501px;">
+      <!-- stretchy base and underscript in munderover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munderover>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+            <mspace width="200px" height="0px"/>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+          </munderover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 151px; left: 501px;">
+      <!-- stretchy base and overscript in munderover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munderover>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+            <mspace width="200px" height="0px"/>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+          </munderover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 301px; left: 501px;">
+      <!-- stretchy scripts in munderover -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munderover>
+            <mspace width="200px" height="0px"/>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+            <mo lspace="0" rspace="0" style="color: green;">⥚</mo>
+          </munderover>
+        </math>
+      </div>
+    </div>
+
+    <div style="position: absolute; top: 1px; left: 751px;">
+      <!-- Only stretchy operators in munderover. The widest unstretched size
+           is used as the target size. -->
+      <div style="position: absolute; left: 0; top: 0;">
+        <math>
+          <munderover>
+            <mo lspace="0" rspace="0" style="font-size: 1em; color: green;">⥚</mo>
+            <mo lspace="0" rspace="0" style="font-size: 4em; color: green;">⥚</mo>
+            <mo lspace="0" rspace="0" style="font-size: 2em; color: green;">⥚</mo>
+          </munderover>
+        </math>
+      </div>
+    </div>
+  </div>
+  <script>
+    MathMLFeatureDetection.ensure_for_match_reftest("has_mspace");
+    MathMLFeatureDetection.ensure_for_match_reftest("has_munderover");
+  </script>
+</body>
+</html>