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diff --git a/layout/reftests/mathml/shadow-dom-1.html b/layout/reftests/mathml/shadow-dom-1.html
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+++ b/layout/reftests/mathml/shadow-dom-1.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<title>Test for bug 1066554 - Shadow DOM loads MathML stylesheets as needed</title>
+<body>
+  <div id="x"></div>
+  <script>
+    function insertShadowMathML() {
+      var x = document.getElementById("x");
+      x.attachShadow({ mode: "open" });
+      x.shadowRoot.innerHTML =
+        '<math><msup><mi>X</mi><mi>X</mi></msup></math>';
+      document.documentElement.removeAttribute("class");
+    }
+    window.addEventListener("MozReftestInvalidate", insertShadowMathML);
+  </script>
+</body>
+</html>